This article will contains various comments about privacy connected with cellular devices (in GSM networks)...
First of all, I must say, that you don't have something like that. Each time, when phone exchange data with operator stations, he know phone and SIM card details. If you have bought SIM card with concract, he know you personal info too. Of course this is not 100% reliable (phone can be not used by owner), but... This location data should be secret and the most often are. But now always...