Sim Not Valid


    Hello my name is George , i am from Country Georgia, so i bought iphone 6 from someone in my country about 2 years ago , it worked fine before i restored it yesterday  and suddenly it said that Sim is Not valid , i cant activate iphone 6  i checked it and it says that is blocked from T-Mobile, i am surprised that it was just worked fine about 2 years , i dont know what happened i dont understand  how its possible to block after 2 years from T-Mobile? please somebody help me , i really need to activate my iphone, i dont have opportunity to buy a new one  , please help me

      All replies