[Q] Buying Nokia Lumia 900 tomorrow from Craigslist

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http://forum.xda-developers.com – So I'm probably gonna buy this phone tomorrow because my htc one x fell and has a broken screen now. I have no warranty so I need a phone badly. My question is can a AT&T branded phone have a bad esn or imei I think its called stopping me from activating it on my account? (HowTos)