What is AT&T doing at 1111340002?
Even in relatively technical circles, like HN, many people are not aware of this and I use every opportunity I have to reiterate:A SIM card is a full blown computer with its own CPU and memory.Your carrier can upload and run arbitrary code without your consent or knowledge.  They can do this at any time.This means that your "phone" is actually three different computers running in concert - the actual phone itself (iOS or Android or Symbian), the baseband processor running the baseband code, and the SIM card.