Or are you talking about the stories that the CIA can turn on your phone's mic and eavesdrop on you at any time? (Those are urban legends, brought on by movies that "do" that. Why would anyone spy on a random phone like that? [No, they can't connect to your phone by phone number, even your carrier doesn't do that - to them, you're your SIM number. The only place they meet is in the carrier's database that matches SIM numbers and phone numbers.])