Well I heard from a friend of mine that in Argentina the cellphone provider can access to your info.

The case was this one. He was cheating her girlfriend, a friend of her accessed to my friend's text messages log, saw the evidence, and told to the gf about it. Apparently, but I never confirmed this, the friend (the one who read the messages) worked in the cellphone provider of my friend.

Since then I know I can't trust in my cellphone ever again, but I always was suspicious about this could be possible.