Wanna buy, What do you Recommend?

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http://forum.xda-developers.com – Hello guys, I am planning on buying this phone because its great. But before I do I wanted to get some things straight. To start I live in Mexico, and im planning on buying it from Ebay, so the phone will most likely be an AT&T version phone. Will EDGE/2g/3g/4g work outside the US, 4G and the rest are available in my area but ive read that sometimes that and the WiFi gets messed up when you root it. I definitely want to root it, so I can use Titanium backup and other apps that need root. Basically my question is... Will there be any problems if I buy a US (American) phone and use it (HowTos)