Hello all, looking for some desperate help as this is really bothering me. Alright so I purchased two used iPhone 5's one black one white. Black to be used with Straight Talk, White with T-Mobile. Factory unlocked both anyway. Put both sim cards in. Straight talk worked fine in black, t-mobile brought up no service in white. I switched sims, and the straight talk worked with white phone and the t-mobile phone worked with the black. However the t-mobile won't work in the white. I tried restoring, factory resetting, and also tried doing initial activation with old AT&T sim card with nothing. I don't understand why it works perfecti n the black but won't pick up in the white. I want to say it's the phone but the straight talk worked perfect in the white iphone. I still think it could be a hardware issue. I was also thinking it could be lost/stolen but if that was the case I would think it would work with t-mobile and not straight talk since straight talk runs on same network at AT&T. Help! P.S: It wouldn't bother me to use the white with straight talk and black with t-mobile however I would like to get to the bottom of this for future purposes and when I sell it in the future.