Can't activate IPhone 4S
Hi everyone,
My mum bought me an Iphone 4S in duty free in South Korea airport, she was told it was unlocked, however, when I tried to activate it with my Kazakhstan sim card, it said that I had to use sim card of certain providers. I've checked the model's number in the Internet (MD237C/A), and from what I've learnt my Iphone is supposed to be unlocked. Does anyone know what I should do now? I really don't want to jailbreak it or whatever as I heard that most phones go a bit crazy afterwards. Any help will be appreciated!
iPhone 4S