I bought a used iPhone 5 (at&t but unlocked since then) on CL and it turned out that it was incompatible with Tmobile's network because it didn't support the AW

I bought a used iPhone 5 (at&t but unlocked since then) on CL and it turned out that it was incompatible with Tmobile's network because it didn't support the AWS band 1700/2100[1]. So I went to the Apple store and had the phone replaced for a brand new factory unlocked one (for free!). IIRC after April of this year, all iPhone 5 variants were merged. 1: http://support.apple.com/kb/HT5720 http://support.apple.com/kb/HT5720