AT&T 2440 - Manual (Page 19)

There are three one-touch dialing buttons,
X, Y, or Z, on the base.
Store a One-Touch Number
1 Make sure the phone is off.
2 Press and hold
X, Y, or Z until you hear a beep.
3 Dial the number you want to store.
4 Press the same one-touch button again. You will hear a
confirmation tone.
Delete a One-Touch Number
1 Make sure the phone is off.
2 Press and hold
X, Y, or Z until you hear a beep.
3 Press the same button again to delete the number stored there.
You will hear a confirmation tone.
Dial a One-Touch Number
Press
X, Y, or Z to dial the number stored in that location. The
speakerphone is activated and the stored number is dialed.
TELEPHONE MEMORY
AT THE BASE
18
One-touch
dialing buttons