Around the World

Hey guys, my cell's been acting all sorts of weird since a week ago and I finally put it out of its misery by selling to a friend who works at a local company called P4C Global. Anyways, we were talking about my future winter vacation back to Asia and he suggested that I could pick up a phone there since they're cheaper and slightly more advanced. I'm on T-mobile, so I was wondering what kind of a phone would fit my needs of voice and text. I mean, is there I should look for, like a SIM card or something?