Like others have statead, wiretapping mobile phones is wildly unrealistic in this time period and when it comes to the RP on the server, I don't see any practical appliance of it(When does Police ever get ahold of your mobile phone, and if they do and they can wiretap it, after the first incident the new norm will be that if the Police get your phone somehow, just get a new one). The only real way this would be done is with a wider eavesdropping operation on the mobile network and within a specific range of service but that's beyond impractical when it comes to the server capabilities.