>> mobile phone operators don't seem to be doing much It is in the protocol. Operators are not the only problem here. https://en.wikipedia.org/wiki/Caller_ID

>> mobile phone operators don't seem to be doing much It is in the protocol. Operators are not the only problem here. https://en.wikipedia.org/wiki/Caller_ID_spoofing https://en.wikipedia.org/wiki/Caller_ID_spoofing