Function Keys

RCL STO CLR

PWR VOL FCN

Headset Jack
Connect an optional accessory headset to this jack to provide simple hands-free conversations.

Mouthpiece

Keypad Cover
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Prepare the Battery for Initial Use
The Nickel Metal Hydride or Nickel-Cadmium battery supplied with your phone must be fully charged before placing your phone into service. The batteries are shipped from the factory in a discharged state in order to extend the life of the battery. It is recommended that you charge new batteries for at least 4 hours using the AC Charger/ Transformer, or overnight using the IntelliCharge Desktop Charger. Do not charge the battery longer than 24 hours. (Refer to page 3 if you are using a plug-in charger.)

AC Charger/Transformer

IntelliCharge Desktop Charger
Motorola desktop chargers for the MicroTAC line of products are dual pocket chargers. The chargers front pocket can charge a battery while attached to the phone or by itself. The chargers rear pocket can charge any compatible battery (not attached to a phone).
WARNING Battery may explode if exposed to re. WARNING To prevent injuries or burns, and to avoid damage to the battery, do not allow metal objects to contact or short circuit the battery terminals. Refer to Batteries on page vii for details. CAUTION Charging your battery in anything other than a Motorola charger will void your warranty. CAUTION To avoid damage to the battery, do not place it anywhere that might cause the battery terminals to short together.
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Attach the Battery

1. Place the battery on the phone so that its grooves align. Align the top of the battery with the line on the back of the phone right below the arrows. 2. Slide upward in the direction of the arrows on the back of the phone until it clicks into place.

Remove the Battery

Standard Method
1. Turn your phone off. 2. Depress the latch button on the rear of the battery and slide the battery downward until it stops. 3. Lift the battery off.
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Quick-Change Battery Removal/Replacement
The quick-change method allows you to remove your battery at any time and replace it with a charged spare battery during a telephone call. This is especially useful if you receive the low battery message (Lo bAt ) or audible tone during a call. Simply remove the battery from the phone and put on the spare battery. The phone will not go through the normal power-up cycle described on page 4. You will only have four seconds to complete this action before your telephone call is terminated. It is a good idea to practice this procedure a few times before using it on an actual telephone call. Advise the party on the other end of the call before beginning this procedure.

Using Plug-In Chargers

If you are using a charger that plugs into the bottom of the phone, you must remove the small plastic cover to gain access to the receptacle, as shown below.

Remove Receptacle Cover

Plug Connector into Receptacle
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About the Antenna

There are two parts to the handset antenna, one internal and one retractable. This allows your phone to detect incoming calls without having the antenna extended. For optimum performance, fully extend the antenna when in a call or when placing a call.

Turning Phone On and Off

1. Press 2. Press

PWR PWR

to turn your phone on. again to turn your phone off.

Start-up Self Tests

Each time the phone is turned on, it performs a series of self tests, sounds a tone, and lights all display positions and status indicators to check their operation. The Signal Strength and Battery Meters then display and the keypad lights momentarily, as it will any time a key is pressed or the keypad cover is opened.

Start-up Messages

Message

A1 A2 b1 b2

Explanation
If your phone is programmed for two cellular systems, one of these messages will appear in the display upon power up. These are reminders as to which system and phone number are currently in use. Indicates that the phone has been locked and cannot send or receive calls until unlocked.
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Start-up Status Indicators

Indicator Explanation

IU (In Use) Indicator
Flashes slowly while a call is in progress
NS (No Service) Indicator
Flashes slowly if phone is beyond range of a cellular service area Calls cannot be placed or received while NS is lit

RM (Roam) Indicator

If ashing, you are accessing a Cellular System other than your home system.

Illuminated Keypad

Your keypad lights whenever the phone is turned on, a call is received, or a key is pressed. To help conserve battery power and minimize distractions while driving at night, the display and keypad backlighting will turn off after 16 seconds if no key is pressed. You may reactivate the display by pressing any key or opening the keypad cover. The display and keypad backlighting remain lit during menu use.
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Placing a Call

1. With power on, enter the number you wish to call. 2. Press SND. diALing and the dialed number will alternate in the display until the called party answers. 3. Begin the conversation when the called party answers.

To Correct an Error

To correct an error, press and quickly release CLR to delete the last character. To clear the entire entry, press and hold CLR for about 1 second. Your entire entry will be deleted, and you may now re-enter the number you wish to call.
If Entering More Than 10 Digits
You can call a phone number with up to 16 digits, but only the last 10 digits will appear in the display. To recall a stored phone number that is longer than 10 digits, press RCL and the memory location number. The display will ash the memory location number and the last 10 digits of the number. Press RCL again to view the entire number.
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Unsuccessful Call Attempts
If you hear one of the following signals, you have not successfully completed your call.

Tone / Message

fast busy (reorder signal)

Description

Cellular System Busy
Press SND again before ending the unsuccessful call attempt to automatically redial the call (refer to Automatic Redialing below), or press END and dial the call again.

Snd to rEdiAL

Cellular System Could Not Complete the Call
You may have tried to place a call alternating high/low before the green IU indicator was tone ashing to let you know your (intercept) phone was fully operative. Either Snd to rEdiAL press SND again before ending the unsuccessful call attempt to automatically redial the call (refer to Automatic Redialing below), or press END and dial the call again. busy signal
The Called Partys Line is Busy

Automatic Redialing

Your phone includes a convenient feature that eliminates the need for you to make repetitive call attempts when a cellular system is busy. If you receive an alternating high/low signal (intercept) or the fast busy tone (reorder signal) when attempting to place a call and wish to retry the call, press SND before ending the unsuccessful call attempt. rEdiAL is then displayed.
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Your phone will make the call attempt continuously over the next four minutes. Once a connection is made, the phone will ring once to alert you so that you may lift the phone to your ear and begin the conversation. You do not have to press SND to answer the call. If four minutes is insufcient time, press SND to begin another cycle. You may terminate Automatic Redial by turning off the phone, or by pressing END. NOTE Automatic Redial applies only if the cellular system is busy, and will not engage when the called partys line is busy.

Storing a Phone Number

1. Enter the phone number you wish to store (up to 16 digits). 2. Press STO. 1 , 3. Enter a two-digit location number (e.g., 2 , etc.). 4. The location entered is displayed to conrm storage. NOTE If FULL displays, refer to Memory Protect Feature on page 13.
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Storing an Area Code and Prex (Postscripting)
1. Enter the area code and prex you wish to store. 2. Press STO. 1 , 3. Enter a two-digit location number (e.g., 2 , etc.). 4. The location entered is displayed to conrm storage. NOTE If FULL displays, refer to Memory Protect Feature on page 13. Storing an area code and prex for a frequently called location (such as an ofce) offers a convenient means of postscripting the four-digit extension of the party you wish to call. To place a call using postscripting, see Recalling Area Code and Prex (Postscripting) on page 17.

Memory Protect Feature

The directory has an automatic memory protect feature which prevents the accidental overwriting and loss of previously stored numbers in memory. If you attempt to store an entry to a currently occupied memory location, the location number and FULL will display. The display will then alternate between the previously stored number and ChAngE?. If you wish to save to that location, thus overwriting and erasing the old information, press STO. If you wish to store the entry in an alternate location, press END , STO and the alternate location number.
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Deleting a Memory Entry

1. Press and hold CLR , then press STO , and enter the two-digit location number you wish to delete. 2. The phone will display FULL , ash the number in memory, followed by ChAngE?. 3. Press STO to delete, or press END to exit without deleting the entry.

Changing a Memory Entry

1. Press RCL and the two-digit location number so that the number to be changed is displayed. 2. Repeatedly press CLR to back out each of the digits displayed (all the digits, or just the ones you wish to change). 3. Enter the new digits. 4. Press STO and the same two-digit location number. 5. The location number and FULL will display. The display will then alternate between the currently stored number and ChAngE?. 6. Press STO to save the newly entered number in this memory location, overwriting the currently stored number.

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About Recalling from Memory
Phone numbers stored in memory can be recalled in any of three ways: By entering a two-digit location number By scrolling using the Memory Location Numbers By pressing any of the One Touch Dialing Keys (described in One Touch Dialing Keys on page 17) Using any of these methods, once a phone number is displayed, you may place a call to that number by pressing SND. NOTE You may also scroll through the memory locations while in a call (for instance, if you want to look up a phone number to pass along to the other party). When nished, press END. This will cancel scrolling, but will not end your current call.
Placing Calls by Entering Two-Digit Number
1. Press RCL. 2. Enter the desired two-digit location number. The display shows the location number, then the last 10 digits of the stored phone number. Press RCL again to view the complete number. 3. Press SND to place a call to the number stored at the two-digit memory location.
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Placing Calls by Scrolling
This method allows you to review your memory locations by memory number, beginning with the location of your choice. This is useful when searching for a specic number in memory when you are not certain of its location. 1. Press RCL , then the two-digit memory location number where you wish to begin your review. (For example, to scroll from the beginning, press RCL , 0 , 1.) 2. The location number and digits stored will appear in the display. An apostrophe () following the location number conrms that you have enabled memory scrolling. 3. Press to scroll forward thru the memory locations. Press to scroll backwards. 4. At any time while scrolling, you may press SND to place a call to the displayed number. NOTE Memory Scrolling may also be performed during a call. Pressing END while scrolling during a call extinguishes the apostrophe () and cancels scrolling, but does not terminate the call.
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Last Number Redial

Press SND to place a call to the last number entered. This feature automatically remembers the last phone number entered from the keypad or recalled from memory, but not actually placed (by pressing SND ).
Recalling Last Number Called
1. Press RCL , 0 , 0. The display will show the last number called. 2. Press SND to place a call to this number.
Recalling Area Code and Prex (Postscripting)

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Super Speed Dial Feature

1. Enter the memory location number. 2. Press SND. The number will not appear in the display. All memory locations are equipped with the Super Speed Dial feature. Once information is stored in these locations, the Super Speed Dial feature allows you to place a call without pressing RCL. NOTE The sequence 0 , SND will place a call to the local operator.

Scratch Pad Memory

The scratch pad permits entry of numbers from the keypad during conversation. If your party gives you another number to call, simply enter this from the keypad. If you make an error, press CLR to erase the last digit entered, or hold CLR to erase the entire entry. Advise your party that they will hear tones as you enter the number. To call the scratch pad number at the end of an ongoing conversation, press END , SND.
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Two-Part Tone Dialing

Your phone provides the standard Dual Tone MultiFrequency (DTMF) signals typically used to access alternate long distance services, signal pagers, answering machines, etc. Generally, these services use a two-part procedure: First, a call is placed from memory or by using the keypad to a central telephone number. Then, you either receive a secondary dial tone, or are prompted to enter additional digits, such as a pager number, calling card number, etc. To tone dial from the keypad, make the initial call, either from memory or by using the keypad. When prompted, enter additional tone digits using the keypad. The tones are automatically sent as you press the keys. Do not press SND. To tone dial from memory, make the initial call, either from memory or by using the keypad. When prompted, recall from memory (using RCL , location number) the number you wish to send as DTMF digits. Press RCL , SND. Repeat these steps as required to send additional groups of numbers.

Memory Linking

The Memory Linking feature provides improved convenience when dialing constant number sequences, such as when accessing paging systems, retrieving voice mail, etc. It allows multiple number groups (e.g., main number, bank PIN code, and account number) to be stored in a single memory location, each group separated by a pause (o ). Pauses are created by pressing FCN , SND. You may then place a call using this memory location, and sequentially transmit each number group (by pressing RCL , SND ) at the appropriate system prompt.
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Example of Memory Linking
In the following example, a Memory Linked number is created to access information for a bank account. The number consists of the banks telephone number (1234567), a bank PIN code (888) and # sign, and an account number (22) and # sign, as shown below. NOTE A maximum of 16 digits can be stored in a memory location. A pause counts as one digit. If your Memory Linked number requires more than 16 digits, you can store part of the number in one memory location (e.g., the main access number) and the remainder in another memory location.

Bank's Phone Number

# Sign
Account Number Pause # Sign
To construct the Memory Linked number, perform the following steps.
Instruction and Key Sequence
1 Enter the banks telephone number 1 , 2 , 3 , 4 , 5 , 6 ,

Display

1234567
or recall it from memory location xx RCL , x, x 2 Create a pause
3 Enter the bank PIN code and # sign 8 , 8 , 67o888C 4 Create another pause

456 7o888Co

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Instruction and Key Sequence Display
5 Enter the account number and # sign 7o, 2 , 88Co22c 6 To store the number, press STO and the two-digit location number. Now that the Memory Linked number has been created and stored in memory, you may place the call as follows. 1. Press RCL , 2-digit location number, and SND. (Your phone will send the banks phone number, and then wait at the rst pause.) 2. When the system answers and prompts you for your bank PIN code, simply press RCL , SND to transmit your bank PIN code and # sign. 3. When the system prompts you for your account number, press RCL , SND again to transmit your account number and # sign. NOTE If the security PIN code feature is activated (see PIN Code Operation on page 30), the security PIN code will automatically be sent after the rst pause by pressing SND. Do not add your security PIN code to the linked sequence. NOTE If you have divided your Memory Linked number into two memory locations (e.g., 03 and 04), place the initial call by pressing RCL , 0 , 3 , SND. When the system answers and prompts you, press RCL , 0 , 4 , RCL , SND to send the rst number group (up to the pause). Press RCL , SND to send each remaining number group stored in location 04. NOTE Some electronic systems require that DTMF tones be sent for several seconds by pressing and holding a key. These signals, known as Long Tone DTMF, cannot be transmitted using Memory Linking. If Long Tone DTMF signals are required, you must send them manually.
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Display Own Phone Number

1. Press RCL ,. 2. Your phone number will be displayed. 3. When you have nished viewing, press

Microphone Muting

To mute microphone

While in a call, press

To disable mute
Press FCN , 6 again. This feature allows you to confer privately with others in the car during a call. It will disable the microphone and display M<UtE. The mute feature is canceled when you end your call.

Automatic Answer

HH nEQW (HH is the number of new messages) OO nEQW (when there are no new messages) no M<ESgS (when there are no old or new messages)
2. Scroll through the messages in the message center by pressing to move forward and to move backward. 3. Press END to exit the message center. As you scroll through the messages, each Calling Line ID message will be labeled with either HH nEQW (new message) or HH Cid (old message), where HH is the message center location number. As you view each message, the display will cycle through the Calling Line ID information (as shown in the following example) until you scroll to the next message or place a call to the displayed number.

Example

18475551212
Placing a Call to a Calling Line ID Number
After recalling the desired Calling Line ID number (the number appearing in the display), press SND to place a call to this number.
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Storing a Calling Line ID Number in Memory
With a Calling Line ID message displayed, press STO and select a memory location (as described in Storing a Phone Number on page 12). The Calling Line ID number will be stored in the selected location.
Deleting an Individual Message
1. While in the message center, scroll through the messages using and until the message you wish to delete is displayed. 2. Press and hold CLR until dELEtEd appears in the display. After deleting a message, the message center will be automatically renumbered. For example, if message #5 is deleted, messages #6 through #20 will be moved up one to become #5 through #19.

Deleting All Messages

1. While in the message center, press and hold CLR until ErASE and ALL? alternate in the display. (The display will briey show dELEtEd before ErASE and ALL? appear.) 2. Release CLR , then press CLR again to conrm erasing all of the messages. M<SgS ErASEd will appear in the display.

Other Messaging Services

In addition to the Calling Line ID feature, some cellular systems allow other types of messages to be sent to your cellular phone. One such service is Voice Mail Notication. This service provides a notication message to the your cellular phone each time a new message is recorded in the Voice Mail system. Voice mail notication messages are stored in the same message center that stores your Calling Line ID numbers. Contact your Cellular Service Provider for more information and availability of these messaging services.
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VOX Operation

Voice Operated Transmission (VOX) is a method of conserving battery power by activating the phones transmitter only while talking. In this manner, your batterys charge can be extended. To enable/disable the VOX feature, refer to Selecting and Deselecting Features on page 32.

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No restrictions. (Standard setting)

LEuEL 4

Phone will place calls only from memory locations 1 thru 1 - , SND ). If 10 ( RCL , 0 LEuEL 1 locations 1-10 are cleared, no outgoing calls can be made. No keypad dialing. No directory storage. No Turbo Dial or Super Speed Dial features.
To change the phone to unrestricted operation, use the procedure above and enter service level 4.
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Cellular System Overview

There are generally two types of cellular systems serving any metropolitan area. One of these will most likely be operated by the telephone company that provides telephone service to your community, generally referred to as a wireline carrier. The other cellular service provider is a radio common carrier, referred to as a non-wireline carrier. Your Cellular Service Operator will provide information concerning specic features, procedures, and coverage in your particular area.

Service Area

The area within which the phone operates is dened by your cellular service provider. Since this is a radio system, no exact boundaries (as on a map) can be drawn. The red NS (No Service) ashes if you are beyond range of a service area. There may be locations within your area, such as tunnels and underground parking facilities, where the unit may act as if it were beyond range.

Weak Signal Alert

If you are called in a location the system determines is inadequate for high quality service, you may hear series of beeps to inform you of the call attempt. The caller will receive the recorded Not In Service message. CALL will appear in the display, and the green on indicator will ash quickly. If this occurs, you must press CLR before the phone will operate. Most systems do not impose air-time charges for such call attempts. NOTE This indicator is controlled through the initial programming of your phone. Refer to the Programming Guide for more details.
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Switchhook and Advanced System Services
Press SND. During a call, pressing SND performs a switchhook function used to access enhanced Cellular System features such as call waiting and conference calls. For the functioning of these features with SND , consult your Cellular Service Provider.

Roaming

The term Roaming applies to the use of cellular telephones within systems other than those designated as their Home systems. RM (Roam) lights whenever the phone comes within range of a visited system. As your phone begins to roam, it seeks service according to the conditions you have selected (see Reviewing / Changing Scanning Mode on page 45). Contact your system operator, or that of the visited system, for information on dialing and billing procedures. To use alternate long distance services when roaming, be certain to dial the appropriate area code and local number to access the alternate carrier in the visited area. Then use the tone dialing sequence described on page 21. If you selected Two-System Operation (see Two-System Operation on page 44), enter RCL , to verify the currently active number. This is especially important if your two home systems have different area codes, or if RM is ashing within your home service area. Note that when you roam, the visited system may require that you enter your security PIN code. Refer to PIN Code Operation on page 30 for details on using PIN operation. If you have a problem, contact the local system operator or your home system operator for further information.

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Scanning Modes

The following table lists the scanning modes available for your phone.

Scanning Mode

Standard Mode Your phone rst seeks a home type system, then a non-home type. If home system is non-wireline (type A) If home system is wireline (type B) Invert Preference Mode Your phone rst seeks a non-home type system. (Select this mode if in a fringe area of your home system or in certain roaming situations.) If home system is non-wireline (type A) Flashing RM = call on B system Flashing IU= call on home system If home system is wireline (type B) Flashing RM = call on A system Flashing IU= call on home system Home Only Mode Phone will not operate outside its home system. Scan A Mode Phone will operate only within nonwireline (A) systems. Scan B Mode Phone will operate only within wireline (B) systems.

Std Ab Std bA

SCAn bA

SCAn Ab HOM<E

SCAn A

SCAn b

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Preferred SID Mode Phone will scan for home or programmed preferred SIDs rst. This choice requires entry of up to 60 System ID numbers for those systems in which you wish to operate. Contact your Cellular Service Provider for SID information.

P SCAn

If you have selected two system operation, the phone seeks cellular service according to the system type mode selected for each phone number. NOTE In order to program Preferred SIDs to be used in P SCAn mode, press 7 , 9 , 7 , 4 , 3 (spells SYSID), then press FCN , FCN and enter the appropriate 5-digit SID number (from your Cellular Service Provider), then press STO. Now press or to cycle through the system type choices (HOM<E , rOAM< , or inhibit ). With the desired system type displayed, press STO to select that choice. To program another Preferred SID, press and repeat the above process, or press END to exit Preferred SIDs programming.
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Before Calling For Service

Is the phone locked?

See Electronic Lock, page 39.

Is NS (No Service) lit?

See Start-up Status Indicators on page 5.
Have you charged the battery?
Refer to Prepare the Battery for Initial Use on page 1 for charging instructions.
Have you programmed a unique operating mode?
Constant ashing of RM while in your home service area may indicate that an incompatible System Type has been selected. Refer to Reviewing / Changing Scanning Mode on page 45.
Is the phone operating with non-standard settings?
You may have inadvertently selected improper operating characteristics. See Feature Menu, page 32.

Have you selected the wrong home system?
If your phone is programmed for Two-System Operation (see page 44), press RCL , to display the active telephone number.
Are new MicroTAC accessories not working with older MicroTAC phones?
Because of increased charging capabilities designed into your new MicroTAC phone, some accessories that plug into the data connector will not t older versions of MicroTAC phones. NOTE Older versions of MicroTAC charging accessories that plug into the data connector may not charge new MicroTAC phones.
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Notes.

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Regulations and Precautions
The U.S. Federal Communications Commission and the Canadian Department of Communications regulate cellular radiotelephone service in their respective countries. It is important for you, the MicroTAC phone user, to observe the applicable regulations when operating your phone in either country. In addition to these U. S. and Canadian federal regulations, you may also be bound by certain state, provincial, territorial, and local rules and regulations, as well as by your cellular carriers tariff (the rates, terms, and conditions of its service). If you wish to use your phone in both the U.S. and Canada, please consult with your system operator. Furthermore, you should remember that your MicroTAC phone is a radiotelephone system (i.e., it combines both wireline technology, as used in your home or ofce telephone system, and radio technology), and that the scope of regulations and precautions is therefore broader than the scope of regulations and precautions relating to wireline-only telephone usage. Some of the major points of consideration are set out below. Please note, however, that this Rules, Regulations, and Precautions section does not constitute legal advice, and is intended merely for general information purposes. If you have any specic questions, please contact your Cellular Carrier (System Operator). License - If your home system is in the U.S., you do not require a separate license to operate your MicroTAC phone; obtaining a cellular telephone access number is sufcient to register you as a user. If your home system is in Canada, a separate license is required. Your carrier will assist you in the licensing process. If you wish to use your MicroTAC phone in both the U.S. and Canada, please contact your Cellular Carrier (System Operator). Your base should operate in only one location.

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Denial of Service - A cellular carrier may deny service temporarily or terminate service for violation of any governmental regulations or of its tariff. Driving - Your MicroTAC phone is considered a cellular telephone. Some jurisdictions prohibit your using a cellular telephone while driving a vehicle. Even if your jurisdiction does not have such a law, we strongly suggest that, for safety reasons, the driver use extreme caution when operating the MicroTAC phone while the vehicle is in motion (see Driving on page vii). Consumer Responsibilities - Remember that the wireline and radio regulations with respect to harassing calls, false distress calls, obscene language, etc., apply to cellular phone usage. Privacy - As a telephone user, you have come to assume a certain standard of privacy when you place or receive a telephone call via traditional wireline systems. However, because MicroTAC phones utilize radio transmissions to effect calls, the same standard cannot always be assured. While it is unlawful for any unauthorized person to divulge or use any information obtained from intercepting or listening in on conversations intended for others, you should not assume that your conversation is completely secure. Commercially available scanning equipment can permit a third party to monitor the radio channels used for MicroTAC phone calls. Interference - No person shall interfere with or cause interference to any radio communication or signal. Equipment Modications - The U.S. Federal Communications Commission has type-approved the model of MicroTAC phone which you have purchased, and both have allocated a specic frequency range for cellular service. No changes or adjustments are to be made to your MicroTAC phone.
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Reference Message Glossary
A1 A2 Auto AnSrOFF Auto AnSr On Auto LockOFF Auto Lock On b1 b2 b CUMUL System A phone number 1 System A phone number 2 Automatic Answer feature disabled Automatic Answer feature enabled Automatic Lock feature disabled Automatic Lock feature enabled System B phone number 1 System B phone number 2 Battery Meter Precedes Cumulative Timer display (also used to display key) Memory Protect is activated to prevent accidental overwriting of a memory location Calling Line ID number answered (p/o Messaging Services) Message in message stack deleted (p/o Messaging Services) Emergency Dialing in Progress English message prompts selected All messages in message stack deleted (p/o Messaging Services) Spanish message prompts selected French message prompts selected

ChAngE?

Cid dELEtEd EMrgCY EngLiSh ErASE ALL ESPAnoL FrAnc
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FULL HOME All memory locations are full or requested block is unavailable System Type Selection Home Mode
nuALid LocAtn Memory location chosen for storage of phone number is invalid LEUEL 1 LEUEL 4 Lo bAt LocCodE Loc d Call Restriction selected No Restrictions (standard setting) Low Battery 3-digit Unlock Code is displayed Unit is locked Multiple Key Answer is enabled All messages in Message Center erased Microphone muted New message(s) received (p/o Messaging Services) PIN Code feature enabled PIN Code feature disabled Portuguese message prompts selected System Type Selection Preferred SID Mode Precedes Resettable Call Timer Display Automatic Redial

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It is possible that exposing the test cells to radiation for this long resulted in heating. Since this assay is known to be sensitive to heating, heat alone could have caused the abnormalities to occur. The data already in the literature on the response of the micronucleus assay to RF are conflicting. Thus, follow-up research is necessary. FDA is currently working with government, industry, and academic groups to ensure the proper follow-up to these industryfunded research findings. Collaboration with the Cellular Telecommunications Industry Association (CTIA) in particular is expected to lead to FDA providing research recommendations and scientific oversight of new CTIA-funded research based on such recommendations. Two other studies of interest have been reported recently in the literature: 1. Two groups of 18 people were exposed to simulated mobile phone signals under laboratory conditions while they performed cognitive function tests. There were no changes in the subjects' ability to recall words, numbers, or pictures, or in their spatial memory, but they were able to make choices more quickly in one visual test when they were exposed to simulated mobile phone signals. This was the only change noted among more than 20 variables compared. 2. In a study of 209 brain tumor cases and 425 matched controls, there was no increased risk of brain tumors associated with mobile phone use. When tumors did exist in certain locations, however, they were more likely to be on the side of the head where the mobile phone was used. Because this occurred in only a small number of cases, the increased likelihood was too small to be statistically significant. In summary, we do not have enough information at this point to assure the public that there are, or are not, any low incident health problems associated with use of mobile phones. FDA continues to work with all parties, including other federal agencies and industry, to assure that research is undertaken to provide the necessary answers to the outstanding questions about the safety of mobile phones. What is known about cases of human cancer that have been reported in users of hand-held mobile phones? Some people who have used mobile phones have been diagnosed with brain cancer. But it is important to understand that this type of cancer also occurs among people who have not used mobile phones. In fact, brain cancer occurs in the U.S. population at a rate of about 6 new cases per 100,000 people each year. At that rate, assuming 80 million users of mobile phones (a number increasing at a rate of about 1 million per