Anonymous Call Rejection
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A phone feature based on Caller ID. Incoming callers with Caller ID blocking on hear a message stating that this line does not accept calls from callers who block their number. Often free with Caller ID on land lines. Not available from most cell phone services with Caller ID, such as Sprint/Nextel and AT&T/cingular[1][2].
If available:
- enable: *77
- disable: *87