if you had upgraded your iphone to 2.2.1 firware with baseband to 02.30. then turbo sim is the only way. never trust anyone who says it could be unlocked with software method. the rebel sim is from china, highly unreliable. so dont buy it, surely you will get qtel, but the signal would drop and gets disconnected. you can get a good turbo sim anywhere from $37 to $60 and yes you need to buy from US. if you need more details contact me 5453106. i love iPhone but hate the restriction put on..... welcome to iPhone community.