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prank calls , telemarketing calls, and obscene phone calls . caller id provides some protection against unwanted calls, but can still be turned off by the calling party. even where end-user caller id is not available, calls are still logged, both in billing records at the originating telco and via automatic
number identification , so the perpetrator's phone number can still be discovered in many cases. however, this does not provide complete protection: harassers can use payphones, in some cases, automatic number identification itself can be spoofed or blocked, and mobile telephone abusers can (at some...
https://en.wikipedia.org/wiki/Telephone_call