My girlfriend and I will be travelling in USA and using ATandT pay as you go sim cards while there. The only problem is that we don't get International calling.
So I want my gf to be able to use data to void call family on their iphones.
But I don't know anything about apple, so I am not sure what is the best method. What is important is that it uses data and does not default to the cellular system and cost us mucho denairo!!