Samsung SPH-A880TSAQST - Manual (Page 210)

202 Section 3A: Qwest® Service Features: The Basics
Using Caller ID
Caller ID allows people to identify a caller before answering
the phone by displaying the number of the incoming call. If
you do not want your number displayed when you make a
call, just follow these easy steps.
To block your phone number from being displayed for a specific
outgoing call:
1. Press .
2. Enter the number you want to call.
3. Press .
To permanently block your number, call Qwest Wireless TM
Repair at 1-877-879-0611.