A:AnswerThis mobile phone does come with a one year manufacturer warranty. Unless a phone listed as being open-box or refurbished, it would be brand new.
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A:AnswerThe unlocked Samsung J7 is a phone that is compatible with the GSM Network. I believe that T-Mobile is a GSM network as well as AT&T.
Verizon is a CDMA Network. A side note is that most of the world is GSM.