You have two simple options Make your choice
Option 1:
Buy the iPhone, use it as a itouch iPod till Dandy can unlock it for you ( It may take time to get the turbosim so be prepared to wait for a month or two)
Option 2:
Buy an unlocked Phone in Qatar ( It may cost you about 3000 Qr +)

Third option/choice could be not to use iPhone at all which I am sure you will not make