Hi, my AT&T iphone got stolen while I m in Toronto. Since I still have another 1.5 yr contract with ATT and I m not eligible for upgrade till December. I thought it might be a good idea 2 get an unlock iphone in Toronto. So that I can easily get a sim card when I travel internationally. Has anyone done this b4?? If I do that, how to get new sim card that will work with AT&T? Thanks in advance for your help!