Overseas AT&T Hands Down. My kid was able to use AT&T in the UAE and columbia. None of the people in the group with VZ could use their phones in either place. Here in the usa VZ and AT&T are a toss up.
Verizon works well when you go overseas but ya need to call the company tell him the areas you are going to and they will automatically send something thru to your phone for the duration. We had no problems in Mexico, Panama and South America.
But we need a CHEAPER monthly bill. IF anyone knows how we can do this, please let us know. We keep a mom on the third phone line.