I will be traveling to Florida this winter, and plan on using a Straight Talk sim in my phone for service while I am there. What should I know or do, with regards to that? I am with Rogers in Canada, and I am pretty sure they use the same frequencies on AT&T down there, that Rogers uses here. I wasn't sure if I even needed to unlock the phone for it to work, but probably will as that is inexpensive and no big deal.. Does Straight Talk just use AT&T's network, or TMobile's as well? I have the Nokia network app installed on the phone, so can put whatever APN info in that I need to. Thanks in advance for your help.