As everyone else has said, it's really not worth the hassle, buy a cheap reconditioned Turkish phone instead.
I had a friend bring me a new phone out from the UK a couple of years ago, as it was considerable cheaper - however by the time I had paid the tax and got it registered in his name (must be done within 30 days of entering the country) I could have bought one here for not much more and saved us both the run around.