Sprint Nextel MM-A800 - Manual (Page 259)

Section 3A: Sprint PCS Service Features: The Basics 245
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Service
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 Sprint Customer
Service.