Sim unlock issue

magenta3120090

    Hello, I bought Iphone7+ in Montana Kalispell Best buy shop(It's apple authorized dealer),and I choose SIM FREE Iphone at that time,I used T-mobile sim card(5 days temporarily card) for TEST iphone function at that moment, but my Iphone's sim card seen lock by T-mobile,so I can't use my sim card at my country....  could you help me for unlock the IPhone? 

      All replies