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Owner’s Manual
CT-503 Handheld Flip-Style
Cellular Telephone
with Headset Jack
Please read before using this equipment.
Cat. No. 17-11 12
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FEATURES
Your RadioShack CT-503 Handheld Flip-Style Cellular Telephone with Headset Jack is a state-of-the-art personal cellular telephon e. I t has al l of these features:
Easy-to-Read Ten-Character Display — bright orange and
green LED characters let yo u see essential call information i n
almost any lighting condition.
Nine Different Ringer Styles — lets you set the phone’s
ringer to help you distinguish your phone’s ring from that of
another phone.
Ample Talk and Standby Time — the supplied battery (fully
charged) provides about 3 hours of talk time or 40 hours of
standby time.
Headset Jack — lets you connect an optional headset or
earpiece for easy, handsfree operation.
Two Phone Number Capability — lets you use this one
phone with two different cellular services, with a different
phone number from each.
Battery and Cellular Signal Strength Meters — easy-toread graduated bar graphs let you quickly check the battery
power remaining or the current cellular signal strength.
Call Tim er s — let you keep track of th e individual and cumulative call times (air-time), and includes a timer that you can
reset as you wish (so you can track monthly airtime, for example).
©
1998 Tandy Corporation.
RadioShack is a registered trademark used by Tandy Corporation.
All Rights Reserved.
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Memory Dialing — lets you store up to 40 phone numbers
(of up to 32 digits each) in memory and dial any of them by
pressing one, two, or thr ee buttons.
Memory Scrolling — lets you rapidly search t he memory locations for a number you stored.
Last Number Redial — lets you quickly redial the last number you called.
Scratchpad Memory — lets you temporarily store a num ber
(even during a call), then easily dial it.
Security Features — to prevent unauthorized phone use,
you can lock the phone (so it cannot be used at all) or set it
so calls can be placed only to numbers stor ed in memory locations 01–10.
Special Messaging Service Features — the phone is preprogrammed t o work with special (subscription-onl y) messaging services offered by many cellular carriers, including
calling line ID and voi ce mail notificat ion.
Automatic Answer — lets you set the phone to answer automatically after two rings (if you are using optional handsfree
equipment, for exa mp le) .
Handsfree Feature — the phone is preprogrammed to work
with most optional handsfree equipment .
We recommend you record your phone’s Electronic Serial
Number (ESN) here. The number is on the back of the handset under the battery.
Serial Number _______________
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TABLE OF CONTENTS
A Look at Y our Phone ............................................. .......... 6
Reading the Display/Indicators .................................... 7
Using the Battery ............................................................. 10
Installing the Battery ................................................... 10
Charging the Battery .................................................. 11
Checking Battery Power ............................................. 12
Replacing a Battery During a Call .............................. 13
Important Battery Tips ................................................ 14
Basic Operation ............................................................... 15
Turning the Phone On/Off .......................... ................ 15
Signal Strength/Service Area ......... .......... .................. 15
Making a Call ............................................................. 16
Answering a Call ........................................................ 18
Adjusting the Volume ................................................. 19
Making Emergency Calls ........................................... 20
Redialing Numbers ..................................................... 21
Displa y in g N u mb e rs ..... .......... .......... .. .......... .......... .. .. 23
Menu Functions ............ ............................... .. .......... .. ...... 24
Overv ie w . .. .. .......... .......... .. .......... .......... .. .......... ......... 24
Using the Menu Functions ......................................... 27
Using Memory .................................................................. 31
Storing Speed Dial Numbers ...................................... 31
One-Touch Dialing ...................................................... 32
Speed Recall/Dialing .................................................. 32
Memory Scrolling/Dialing ........................................... 33
Changing a Number in Memory ................................. 34
Cleari ng a Me m o ry ..... .. .......... ... ......... .......... ... ......... .. 34
Using Sc ra tc hpad Mem o ry ..... ... ......... ... .......... ......... .. 35
Memory Dialing Tips .................................................. 35
Security Features ............................................................ 36
Locking Your Phone ........... ........................... ............. 36
Using the Service Restriction ..................................... 39
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Special Features .............................................................. 40
Using the Messaging Functions ................................. 40
Using the Call Timers ................................................. 42
Selecting the Active Phone Number ............. .............. 45
Setting the Cellular System Type ............................... 46
Roaming ..................................................................... 49
Using Cellular System PIN Dialing ............................. 49
Using the Phone with Handsfree Equipment .............. 51
Using a Headset ......................................................... 51
Using Touch-Tone Services ....................... ........ ......... 52
Trou bleshooting ................. .......... .................... ................ 54
Safety Information ........................................................... 55
Traffic Safety .............................................................. 55
Operating Environment ............................................... 55
Emergency Calls ........................................................ 56
FCC Regulations ........................................................ 57
Care and Maintenance ..................................................... 58
Specifications .................................................................. 59
Patent Information ...................................................... 59
Display Message Glossary ................ ................... ........ .. 61
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A LOOK AT YOUR PHONE
3
1
2
4
Retractable Antenna
1.
5
6
7
Extend during a call for optimum performance.
2. Earpiece
Alphanumeric Display (Ten-Character LED)
3.
Displays the status indicators, phone number, memory
location number, and message.
Alphanumeric Keypad
4.
Enters call information or programs functions.
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5. Function Keys
RCL
—Recalls a function or numbers stored in memory.
CLR
—Removes charact ers or clears functions.
END
—Ends a call or exits the functions menu.
SND
—Places or answers calls.
VOL
— Increases or decreases the ringer, earpiece, or
headset volume levels.
FCN
—Selects funct ions.
STO
—Stores to memory or turns on functions.
PWR
—Turns the phone on and off.
6. Headset Jack (s ide of phone)
7. Flip Cover
READING THE DISPLAY/INDICATORS
Your phone’s display provides a full range of messages and
special indicators to assist you with the phone’s operation.
Since many of these messages contai n m ore characters than
your phone can display at one time, the phone displays most
messages across more than one display. For example, the
phone displays
to indicate that the Emergency Call feature is turned on.
On
EMrgCY CALL
then (within about 1 second)
Note: When referr ing to a displayed message, this manu al includes the entire message all together (such as
On).
CALL
EMrgCY
A few of your phone’s many indicators are briefly described
on the following pages. For a complete listing of display messages and indicators, see “Display Message Glossary” on
Page 61.
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Signal Strength Indicator
Indicates the relative strength of the signal being received by
your phone.
See “Signal Strength/Service Area” on Page 15
Battery Charge Indicators
.
Represent the current voltage level of the battery.
“Checking Battery Power” on Page 12
.
IU (In-Use) Indicator
Flashes when a call is in pr ogress.
8
See
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NS (No Service) Indicator
Flashes if the phone is beyond the range of the cellular service area, meaning calls cannot be made or received.
“Signal Strength/ Service Area” on Page 15
.
See
RM (Roam) Indicator
Flashes if the phone is accessing a service area outside of
your home system (roaming).
See “Roaming” on Page 49
.
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USING THE BATTERY
Warning:
injury, or burns if a metal object (such as a pen spring, beaded chain, or piece of jewelry) contacts the battery’s terminals
and causes a short circuit. Be ca reful when placing a charge d
battery inside a coat pocket, purse, or other container that
might contain metal objects.
Caution:
(You can put them in the battery recycling box at your local
RadioShack stor e.) They must not be disposed of in municipal waste.
A detached battery could cause property damage,
Batteries must be recycled or disposed of properly.
INSTALLING THE BATTERY
Align Here
Latch
1. Place the bat tery flat against the back of the phone and
align the top of the battery below the raised arrows.
2. Slide the battery toward the top of the phone until it
snaps into place.
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To remove the battery
press the latch at the top of the battery and slide the battery
toward the bott om of the phone unt il it stops. Then lift the bat tery off the phone.
Note: If you have an extra charged battery and the currently
installed battery becomes low during a call, you can change
the battery without ending the call or losing the connection.
See “Replacing a Battery During a Call” on Page 13.
, be sure the phone is turned off, then
CHARGING THE BATTERY
The nickel metal hydride battery supplied with your telephone
is shipped in a discharged state to extend the battery’s life. It
must be full y charged before you can use your phone.
We recommend that you charge a new battery overnight, but
no longer than 24 hours, using the AC charger supplied with
your phone. Recharging time varies based on the type of battery and the amount of charge left in the battery. See “Recommended Recharging Times” on Page 12.
Follow these steps to charge the supplied (or any approved)
battery using the charger supplied with your phone.
1. Install the bat tery on the phone.
2. Remove the charging jack cover on the bottom of the
phone and insert the charger’s flat plug into the charging
jack.
Note: The plug fits into the jack only one way. If you
have difficulty inserting the plug, turn it over and try
again. Do not force it!
3. Plug the charger’s power cord into a standard AC outlet.
The battery charge indicator appears.
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Notes:
• You can use the phone while it i s charging, but charging takes longer.
• For fastest charging, be sure the phone is turned off if
you are not expecting a call.
4. When the battery is full y charged , disconn ect the charger
from the AC outlet. Then press in the clips on the sides
of the plug and pull it away from the phone to disconnect
the charger. Replace the charging jack cover.
Recommended Recharging Times
Approximate
Battery Type
NiCd Slim 2
NiCd Slim Extra Capacity 31/
NiMH High Capacity (supplied) 51/
NiCd Extra Capacity 51/
Charging Time
(Hours)
1
2
/
4
4
2
CHECKING BATTERY POWER
The phone displays a gradu ated set of up to three battery level indicators ( ) when it is turned on. The more indicators
that appear, the higher the battery’ s current charge level.
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To see a more detailed indication of t he battery’s charge level
FCN
GHI
at any time, press . The battery strength meter ap-
4
pears on the di splay for about 5 seconds. Read this meter in
the same way.
When battery power becomes low, the phone displays
and sounds a warning tone every few seconds. When
bAt
Lo
power becomes too low for the phone to operate, it automat ically turns off. Recharge the battery as soon as possible.
Note: Rechargeable batteries last longer and perform better
if occasionally allowed to fully discharge. You can do this by
leaving the phone on until the phone automatically turns off or
you can use the battery discharge feature of any approved
accessory available for your phone. Do not tr y to discharge
the battery by any ot her means.
REPLACING A BATTERY
DURING A CALL
If you have an extra charged battery and the currently installed battery becomes low during a call, follow these steps
to change the battery without ending the call or losing the
connection.
1. Tell the other party on the line what you plan to do (tell
them, for example, that they will hear some noise as you
remove the battery and you will call back if for any reason you lose the connection).
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2. Remove the battery, and within 3 seconds, install the
fresh battery. Your call is still on the l ine.
Note: If you do not complete Step 2 within 3 seconds,
the call disconnects.
IMPORTANT BATTERY TIPS
• Use only the supplied charger and use only batteries
designed for th is phone.
• You can purchase additional standard or extended
capacity batteries through your local RadioShack store.
• When you are not using the charger, disconnect it from
power. Do not leave the battery connected to the charger
and AC power for more than 24 hours, since overcharging could short en the battery’s l if e.
• When the battery is not in use, store it uncharged in a
cool and dar k place.
• The battery i s a sealed unit with no serviceable parts. Do
not try to open the case.
• For the best results, be sure the battery is at or near
room temperature when you charge it.
• A battery can be charged and discharged hundreds of
times, but it eventually wears out. When the operating
time (talk time and standby time) is noticeably shorter
than normal, get a new battery and recycle or properly
dispose of the ol d one.
• Do not dispose of batteries in a fire.
• Never use any charger or battery that is damaged or
worn out.
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BASIC OPERATION
TURNING THE PHONE ON/OFF
To turn on the phone
phone performs a short self test and sounds a tone, the keypad backlight turns on for about 17 seconds, and
pears. The phone is ready to use when
disappears (see “Signal Strength/Service Area”).
Notes:
• The keypad backlight turns on for about 15 seconds
every time you press a key, then it turns off and all but
the green signal strength indicator disappear from the
display to conserve battery power. W hen the phone is
locked (see “Locking Your Phone” on Page 36), however, the phone’s display goes completely blank about
15 seconds after you press the last key.
• During battery charging, the keypad backlight does not
turn off and the display does not change or go blank
when the phone is turned on and unlocked.
To turn off the phone
blank.
, flip o pen the cover t hen press . The
NS
, press again. The display goes
PWR
PWR
ap-
on
(no service)
SIGNAL STRENGTH/SERVICE AREA
The phone always displays a green signal strength meter
when it is turned on to indic ate the strength of the cellul ar signal currently being received. The more bars that appear on
the meter, the stronger the signal.
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Notes:
• If few or no bars appear (meaning t he signal strength is
weak) and you want to make or receive a call, move the
phone to a different location so the signal strength
increases.
• When all other display characters disappear to conserve
battery power, the signal strength meter flashes and
scrolls its bars.
If
(no service) appears on the upper left side of the dis-
NS
play, the phone is outside the cellular service area and you
cannot make o r receive calls until you reach an area with service your phone can use.
MAKING A CALL
1. Extend the antenna, flip open the cover, and be sure the
phone is on (
2. Press the number keys to enter the phone number you
want to dial (including the area code, if necessary). The
numbers appear on the display as you press them.
Notes:
• If you make a mistake, repeatedly press to delete
one digit at a time, or hold down to delete all digits.
• The phone can display up to 10 characters at once. If
you enter (or display a message containing) more
than 10 characters, the characters autom ati cally scroll
off the left side of the display. Press at any time to
recall the overflow characters. See “Any Number
Longer Than 10 Digits” on Page 23.
and other indicators appear).
on
CLR
CLR
RCL
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D
END
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3. Press to call the phone number. IU (in use) flashes
4. To end the call, press .
Note: Closing the cover does
and
then
SND
diALin
reappears.
on
g
then the number called appear briefly,
EN
not
end or disconnect the call.
System B u sy Message
In addition to the normal busy signal you hear when a number you call is busy, your phone sounds tones and displays
these messages to indicate that it cannot complete a call.
Tone You See Description
Fast Busy
Snd to
rEdiAL
High/low
Snd to
rEdiAL
When either of these conditions occur, you can press
again to redial the number immediately (see “Using Automatic Redial” on Page 22), or press then dial the number
again.
The cellular system is
busy .
The cellular system
could not complet e the
call.
SND
17
D
D
CLR
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ANSWERING A CALL
When the phone receives an incoming call, it rings and
flashes on t he display. To answer the call, pr ess . To end
the call, pre ss .
EN
CALL
SND
Notes:
• Your phone can receive calls even if the ant enna is not
extended. For optimum performance or if the signal
strength becomes weak, however , extend the antenna.
• If you subscribe to calling line ID service through your
cellular carrier, you can view the calling party’s phone
number on the phone’s display. See “Viewing/Recalling
Messages” on Page 41.
• If your phone receives a call but the signa l strength is to o
weak to support it,
appears and the phone sounds
CALL
a series of beeps. The caller hears the standard “customer not available” message. If this happens, press
to clear
from the display.
CALL
CLR
Missed Call Message
If your phone i s on and receives a call, but you do not answer
it,
the calling party hangs up. The next time you press any key
(except , , or ),
onds to notify you that you missed a call.
appears on the display for about 15 seconds after
CALL
CLR
EN
PWR
reappears for about 15 sec-
CALL
To clear
from the display, pr ess or .
CALL
EN
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ADJUSTING THE VOLUME
Adjusting the Earpiece Volume
To increase or decrease the earpiece volume during a call,
hold down . As you hold down the key, the volume increases or decreases (depending on the last adj ustment you
made) and the phone displays the volume meter for about 8
seconds. The more bars that appear on the meter, the higher
the volume.
To adjust the volume in the other direction (if the volume is
getting louder, for example, and you w ant it to be softer) release then hold it down again within 8 seconds.
Adjusting the Ringer Volume
VOL
VOL
To increase or decrease the ringer volume at any time, press
FCN VOL
then hold down until you hear the desired ring volume. As you hold down the key, the phone sounds a gradually louder or softer ring tone (depending on the l ast adjustment
you made) and displays the volume meter for about 8 seconds. The more bars that appear on the m eter, the louder t he
ringer sounds.
To adjust the volume in the other direction (if the ring tone is
getting louder, for example, and you w ant it to be softer) re-
VOL
lease then hold it down again within 8 seconds.
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Using Mute
To turn off the phone’s microphone during a call so the other
party on the phone cannot hear you (so you can tal k privately
with someone else in the room, for example), press
MNO
6
.
appears.
MUtE
FCN
MNO
To turn the microphone on again, press again so
disappears.
MUtE
Hint:
To help you remember which key to use, note that “M”
MNO
(for mute) appears on the key.
6
6
FCN
Note
: Pressing to end a call also turns the microphone
EN
back on.
MAKING EMERGENCY CALLS
Your phone is preprogrammed t o let you dial your local e me rgency number (such as 911) at the press of a single button,
even if the phone is locked (see “Locking Your Phone” on
Page 36). Before you can use this feature, however, you
must first program the emergency number you want to use in
memory location 01 of your phone. See “Storing Speed Dial
Numbers” on Page 31.
To place an emergency call
gency number, simply hold down for about 1 second.
The phone displays
ber.
20
once you have stored the emer-
EMrgCY
and dials the emergency num-
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