[Q] question,need some help

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http://forum.xda-developers.com – Question, phone reported lost from amazon never recieved it,after a week phone was replaced,now the other phone was found can this phone be used again by one of my family members,it has a sim card inside the phone.I told her I was sending it back and that it probably was put on a black list.But I am curious with all the new technologies out there is it possible,can I give it to her and she could bring it to her carrier and use it. (HowTos)