A:AnswerThe carrier should be irrelevant! Its based of your phone! Now if its a carrier + GPS version that might be something to it that im not aware of so maybe just AT&T a call and get their advice.
A:AnswerYes you can. Plus plays music, does voice text or type and more! Tracks your steps, and can set up an alert safe button where if you are in trouble it sends message to your friend or family and says where you are.
A:AnswerI came from the US to the Philippines and it has not issues here and even synced with my unlocked Sony phone so I would most defintiely yes as it is dependent on your device compatibility to the region. If your phone is working it will and certainly in a WiFi environment it will update