Hi Newbie here. I am travelling to Vietnam and Thailand (from the US) and would like to be able to use my new Bionic (on Verizon) for both local and calls back to US numbers. Is it possible to buy a sim card there and use it. I don't know how this all works so any advice is greatly appreciated! Last time I went to Malaysia with my Verizon Storm, they wanted almost $3/minute so I used Skype instead but would really like to use the Bionic this time. Thanks!