How can I erase numbers from programmed memory buttons without entering new ones?

The manual is available here: www.uniden.com/pdf/CEZ260om.pdf. If you search google for "uniden cez260 corded phone manual" it is the first result.


You can find the instructions in the fourth column of text under "Storing a Name and Number in Memory"

Here is the text from that section, but I can't promise the copied text is accurate. Check the pdf at that address if anything doesn't work.
Storing a Name and Number in Memory
1. Press STORE. LOCATION? shows in the display.
2. Press the desired memory location (0 to 9 or quick call buttons A, B, or C.) NOTE: Press LEFT or RIGHT to scroll through 0 - 9 or quick call buttons A, B, or C to select a location.
3. Press STORE again to con? rm the memory location. NOTE: Use Delete to erase existing memories or to correct errors.
4. Use the number keys to enter the telephone number (up to 32 digits) and then press STORE to save. (The unit will not dial a phone number in this mode.) The cursor automatically moves to the text line for name entry.
5. Use the number keys to enter the name of the person associated with the telephone number you just entered. More than one letter is stored in each of the number keys. Press the keys multiple times to scroll through the letters for that key. For example, to enter "B," press "2" twice. Press LEFT two times to create a space. NOTE: The ? ashing cursor automatically moves to the next position or you may press LEFT or RIGHT to move the cursor to the next position.
6. Press STORE to save the name.
7. To enter another name and number in a di erent memory location, return to step 1 and repeat this process.

Storing a Pause in Memory
The REDIAL/PAUSE button has dual functionality and becomes a pause button when pressed in sequence after the STORE button. It is valid only when storing a number into memory locations. Use the REDIAL/PAUSE button to insert a pause when a delay is needed in an automatic dialing sequence (for example, when you must dial a 9 to get an outside line or when you enter codes to access your long distance company).
NOTE: A pause is 3 seconds in length and you can store more than one if a longer pause is needed. Changing a Stored Number Repeat the storage sequence under Storing A Name and Number in Memory, and press DELETE to delete the old number before entering the new number.

Erasing a Stored Name & Number
1. Press STORE.
2. Press the memory location (0 to 9 or quick call buttons A, B, or C) to be erased.
3. Press DELETE.

Copying Caller ID Memories to User Memory
1. Press LEFT or RIGHT to view the caller number and name you want to copy.
2. PressSTORE.
3. Press the memory location (0 to 9 or quick call buttons A, B, or C). The number ? ashes if there is a number already stored in that memory location.
4. Press STORE to enter Edit mode, and then pressSTORE again to edit the name. NOTE: Select a di erent memory location by using LEFT and RIGHT to scroll through 0 - 9 or quick call buttons A, B, or C.
5. Press STORE to con? rm and save. Wait three seconds to exit.
NOTE: If the name you want to enter is longer than 12 characters, only the ? rst 12 characters will be copied into memory.

Storing a Redial Number to Memory
1. Press STORE.
2. Press any key (0 to 9 or quick call buttons A, B, or C) for the memory location. If a number is already stored in the memory location, it will appear on the display. Use LEFT and RIGHT to select a di erent location.
3. PressSTORE again to con? rm.
4. Press REDIAL/PAUSE, and then press STORE again.
5. Enter the name, if necessary, and then press STORE to con? rm.

Copying a Redial Number to Memory
1. Press REDIAL/PAUSE while on-hook. Redial number will display along with PICKUP PHONE.
2. Press STORE.
3. Press any key (0 to 9 or quick call buttons A, B, or C) for the memory location. If there is a number already stored in the memory location, it will appear on the display. Use the RIGHT or LEFT buttons to select a di erent location.
4. Press STORE twice.
5. Enter name, if necessary, and then press STORE again to con? rm and save.

Dialing Numbers Stored in Memory
1. Press DIAL.
2. Press a memory location button or use LEFT or RIGHT to scroll through stored memory locations to ? nd the desired number. The number in that memory location displays.
3. Press SPEAKER or pick up the handset to dial the displayed number.
OR
1. Lift the handset or press SPEAKER.
2. Press a memory location button or use LEFT or RIGHT to scroll through stored memory locations to ? nd the desired number. The number in that memory location displays.
3. Press DIAL again to dial the stored number.

Programming
memory buttons
External autodial
1. If you are on a call or an open line with dial tone, press Hold
or Rls
2. Press Feature * 1
3. Press a memory button.
4. Dial the external number.
5. Press Hold to store the number.
6. Label your new button.

Internal autodial
1. If you are on a call or an open line with dial tone, press Hold
or Rls
2. Press Feature * 2
3. Press a memory button.
4. Dial the internal number.
5. Label your new button.

Features
1. If you are on a call or an open line with dial tone, press Hold
or Rls
2. Press Feature * 3
3. Press a memory button.
4. Press Feature and the feature code.
5. Label your new button.

Erasing memory buttons
1. If you are on a call or an open line with dial tone, press Hold
or Rls
2. Press Feature * 1
3. Press the memory button you want to erase.
4. Press Hold to erase the button.

You can program a memory button with a new number or
feature.


External autodial:

1. Press (Feature), ( * ), (#1).
2. Press a memory button.
3. Dial the external number.
4. Press OK to store the number.
5. Label your new button.


Internal autodial:

1. Press (Feature), ( * ), (#2).
2. Press a memory button.
3. Dial the extension number.
4. Press OK to store the number.


How to erase memory buttons:

1. Press (Feature), ( * ), (#1).
2. Press a memory button.
3. Press OK to erase the button.

Alternatively, you can download the Nortel T7316 Quick Reference Card from IdacomUSA, your solution for Nortel Repair and Refurbishing.

Before you store a telephone number in memory, make sure the dialing mode is
correctly set for the type of service you have. The default dialing mode is tone
(touch-tone), so if you have pulse (rotary) service, you must first change the dialing
mode. See “To Set the Dial Mode.” The following buttons can be stored into any
memory location: 0-9.
STORING FREQUENTLY CALLED NUMBERS
1. Pick up the handset.
2.Press the store button.
3. Push the desired memory location button.
4. Press the store button.
5.Use the handset number keys to enter the telephone number (up to 16-digits)
and press the store button.
6.Hang up the handset.
NOTE: If you make a mistake, use the delete button to delete wrong digits.
CHANGING A STORED NUMBER
Repeat the storage sequence above. The new number replaces the old number at
the memory location.
ERASING A STORED NUMBER
1. Pick up the handset.
2.Press the store button.
3.Press the memory location (0-9) to be erased.
4.Press delete for three seconds until the number in the display is erased.
5.Hang up the handset.
DIALING FREQUENTLY CALLED NUMBERS
1. Pick up the handset and press the mem button.
2. Press 0-9 for the memory location. The number dials automatically.
OR
1. Pick up the handset and press the dial button.
2. Press the review button for the desired memory location.
3. Press the dial button to dial the number.
OR
1. Press dial button while the handset is still in the cradle.
2. Press the review button for the desired memory location, lift the handset and the
number dials automatically.

Download User Manual

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Are you certain you're programming new codes properly? It should just overwrite the codes when new ones are programmed. If you are doing it right, then I'd say you may want to have the unit repaired/replaced...
To program new codes (just in case):
Push the program button on the control board once for memory 1 OR twice for memory 2. Enter a 4-8 digit code. Push the lock button to end the entry. The unit will emit a 2-second long beep if your code is accepted. (If it doesn't beep, you were too slow. Try again.) Repeat the process for the other memory position.

Changing the programming on a Partner system is done on either ext 10 or 11. At one of those ext's press the feature key and "00"
next press the left hand intercom twice
the display should say system programming
press the left hand intercom button
the display should say central telephone prog extension:
enter in the extension number of the persons phone you wish to rename
the display should say program extension xx
press the left hand intercom button
the display should say the extension number followed by the existing programmed name
enter in name of new person by pressing the number where the letter is then its order on the button so under the 2 button 1 would be A, 2 would be B, and 3 would be C ex. BILL = 22 - 43 - 53 - 53 use the mic/hfai button to erase entry.

either press the right hand intercom to go to the next extension or press feature 00 to exit

Storing a Number in Memory
1. Press the STORE button. ENTER TEL. NO. is displayed.
2. Use the keypad to enter the phone number. You can put spaces in the number and it will still dial correctly. To enter a space, press NEXT button.
• To scroll forward or backward, use NEXT (when the cursor is not at the end of the number) or REVIEW.
• To erase the current digit, press DELETE.
3. When finished, press STORE. ENTER NAME is displayed.
4. Use the keypad to store a name (up to 16 characters). More than one letter or character is available in each of the number keys. For example, to enter the letter "A," press the 2 key once. For a "B," press the same key twice. For a "C," press it three times.
• To add a space, press NEXT.
• To scroll forward or backward, use NEXT or REVIEW.
• To erase the current character, press DELETE.
5. When finished, press STORE. MEMORY LOCATION is displayed.
6. Press the memory location number (0-9 or A, B, C) to store the number.


Here is a link for this telephone off the GE website:
http://www.home-electronics.net/ge/pc/IB/29897GE1_IB.pdf

SECTION 501-14B: Keyless Entry/Computer Operated Locks 1999 Town Car Workshop Manual GENERAL PROCEDURES Programming —Keyless Entry Keypad Code

1. Enter the permanent factory keyless entry keypad code.

1. Press the 1/2 button within five seconds to activate the programming mode. Holding the 1/2 button for more than two seconds will erase all stored customer codes. The existing codes do not need to be erased to program new codes.

1. Enter the new five-digit keyless entry keypad code.

1. To associate the new code with personality positions 1, 2 or 3, press the 1/2 button within 5 seconds of entering the 5th digit of the new code for position 1 or 3/4 button for position 2 or 5/6 for position 3. The door locks will lock and unlock confirming the new code is programmed.

1. If another code is to be programmed, begin entering the code within 5 seconds of the last button pressed.

1. After all new keyless entry codes are programmed:
   • Press keyless entry keypad buttons 7/8 and 9/0 at the same time to exit the program mode.
   • Wait for 5 seconds; the driver door module (DDM) will exit the program mode automatically.
   • -------------------------------------------------------------

Programming —Transmitter

1. Cycle the ignition from OFF to RUN four times within three seconds. The locks will then lock and unlock, confirming program mode has been entered.

1. NOTE: When the first keyless entry remote transmitter is programmed, all other keyless entry remote transmitters are erased.
   Press any button on the transmitter to be programmed.

1. If additional keyless entry remote transmitters are to be programmed, repeat step 2 within 7.5 seconds.

1. To exit program mode, turn the ignition to START or wait 7.5 seconds.

--------------------------------------------------
Programming —Remote Memory Activation NOTE: This procedure must be completed within 5 seconds.

1. Press the SET button on the driver door panel.

1. Press any button on the keyless entry remote transmitter to be associated with a memory setting.

1. Press the 1 or 2 memory button on the driver door panel.

-------------------------------------------------------------
Programming —Autolock and Horn Chirp

1. NOTE: This procedure must be completed within 30 seconds.
   Turn the ignition switch to RUN.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to OFF.

1. Press the UNLOCK button three times.

1. Turn the ignition switch to RUN. The doors will lock and unlock to confirm entry into program mode.

1. Press the UNLOCK button once to toggle the Autolock feature on or off, or twice to toggle the Horn Chirp function on or off. The horn will chirp to confirm toggling of the Autolock feature.

1. Exit program mode by turning the ignition to OFF, START, or wait 7.5 seconds.

----------------------------------------------------------------------------------

1. Enter the permanent factory remote keyless entry (RKE) keypad code.

1. Press the 1/2 button within 5 seconds to activate the programming mode associated with the memory position 1 settings. Holding the 1/2 button for more than 2 seconds after activation erases the stored personal code.

1. Within 5 seconds, enter the new 5-digit RKE keypad code. The door locks lock and unlock to confirm the new code is programmed and associated with the memory position 1 settings. Entering any new personal code automatically erases the old personal code.

1. Press the 3/4 button within 5 seconds to activate the programming mode associated with the memory position 2 settings. Holding the 3/4 button for more than 2 seconds after activation erases the stored personal code.

1. Within 5 seconds, enter the new 5-digit RKE keypad code. The door locks lock and unlock to confirm the new code is programmed and associated with the memory position 2 settings. Entering any new personal code automatically erases the old personal code.

1. Press the 5/6, 7/8, 9/0, 7/8 and 9/0 button within 5 seconds to activate the programming mode or allow the system to timeout.

1. Within 5 seconds, enter the new 5-digit RKE keypad code. The door locks lock and unlock to confirm the new code is programmed. Entering any new personal code automatically erases the old personal code.

Hi,

If you go to the following webpage there is a link to the manual:

http://www.amazon.com/exec/obidos/ASIN/B00005NGRJ/plaza101-20/ref=nosim/

It is under the 'Product details' section. The section on managing the memory start on page 34.

To change a stored number you just follow the initial instructions, namely:

1. Press the STORE button. ENTER TEL. NO. is displayed.

2. Use the keypad to enter the phone number. If you
want to add spaces instead of dashes in the number,
it will dial correctly.
• To scroll forward or backward, use NEXT or
PREVIOUS.
• To erase the current digit, press ERASE.

3. When finished, press STORE. ENTER NAME is
displayed.

4. Use the keypad to store a name (up to 16 characters).
More than one letter or character is available in each
of the number keys. For example, to enter the letter
“A,” press the 2 key once. For a “B,” press the same
key twice. For a “C,” press it three times.
• To add a space, press NEXT.
• To scroll forward or backward, use NEXT or
PREVIOUS.
• To erase the current digit, press ERASE.

5. When finished, press STORE. MEMORY LOCATION is
displayed.

6. Press the memory location number (0-9 or A, B, C) to
store the number.

I hope this helps you.