Samsung SCH-i760 - Manual (Page 144)

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Caller ID
Caller ID alerts you to who’s calling by displaying the phone number of the person
calling when you receive an incoming call. Similarly, if you call someone who has
this feature, your phone number displays on their phone. If the caller’s name and
number are already stored in your Internal Phone Book, the corresponding name
appears with the number.
ᮣ To block caller ID from displaying when you call another user, tap
and then dial the phone number.