How to unmask "no number" calls on cell phones?

I know the person calling is a not a telemarketer. It’s an individual, and when they call my cell it comes up “no number”. How does it get masked to begin with and how do I unmask it?

Answer #1

You can’t see the number but often your phone or your phone service provider will have an option to automatically block calls from all masked numbers. Sometimes the caller gets a message that he can’t call b/c his number is masked.

Answer #2

Where blocking is applied on a call-by-call basis (at the time a call is made), subscribers can block—prevent their numbers from being displayed—by dialing a special code before making a call. In North America and some other regions, the code is *67

Similarly, some countries offer anonymous caller rejection, which rejects all calls when the subscriber’s number is blocked.

http://en.wikipedia.org/wiki/Caller_id

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