Iphone 6s unlock

iherospb

    Hello. I bought iphone 6s from third person in us, it works fine with t mobile sim, now im come back to russia and have a trouble with local sim card, as i know, phone is locked. And i cant contact to guy, who sell me phone, also i cant contact with t mobile support, cuz i dont have a t mobile number. What should i do? I really need to unlock it. Imei 355689074390650

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