I will soon travel to the US, for my first time. I'm hoping to find a pre-paid cellphone plan. I will be in many different cities, constantly traveling and moving to another state = within one week. I'm not very fond of the T-mobile plans as I saw many negative reviews -- I'm also going to make international calls, back to Vietnam. Thanks!
Verizon and AT&T are popular mobile carriers with good coverage. If you want to go the cheaper route, Cricket and MetroPCS both have pre-paid plans but their reception might not be as strong in some places, depending on where you plan to travel to. To call overseas, you might want to get an international calling card as it will be the cheapest option for both you and the person you are trying to reach.
Enjoy your trip! over 5 years ago