RCA 21015 - Manual (Page 40)

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3. Press and hold the flash/delete button for three seconds. The display
shows DELETE ALL?
4. Press the flash/delete button again to erase all CID records from memory.
The display shows NO CALLS. You will hear a confirmation tone.
NOTE: Press the EXIT button once to return to the CID review menu. Or,
press and hold the EXIT button to return to standby mode.
CID E
RRORS
If there is an error in the transmission of information to your Caller ID
phone,
ERROR or INCOMPLETE DATA shows in the display. If you are not
subscribed to Caller ID service or it is not working properly, NO DATA
shows in the display.
NAME
12 34567890 1 2 34 5
01 CALL # 9:58 AM 11/24 NEW
DELETE ALL ?
NO CALLS