Hi I was wondering if tmobile iphone 5 work on att network or not. Here are my questions: 1. Do i need to get it unlocked to work on att network? 2. If I do get it unlocked, does 3g (HSPA+) work on att network? I heard that tmobile uses 1700/2100 while att uses 850/1900 for 3g but I also heard that tmobile uses 1900 for edge speed so device should support 1900 mhz. Does anyone know what frequency tmobile iphone 5 support? Will it work flawlessly on att 3g? Thanks edit: I also heard that Tmobile iphone 5 is basically same as att iphone 5 but just tweaked little bit. I guess that means it supports att 3g frequencies?