These guys are a trusted name in getting a factory unlock for your iPhone. In the past, we presented a couple of articles about their services (here, and here), which gained the trust of users everywhere. They were able to send unlocks to people relatively quickly, until they got bombarded with requests, and they eventually stopped doing it all together.
Well… now they’re back!
To get started with obtaining a factory unlock (which is a permanent unlock, now a temporary one like you’d see in Cydia from Ultrasn0w, or by using a special tool like GeveySIM), you need only to visit their website, and follow the steps. The process is reliable and quick, usually taking less than 24 hours to complete (depending on volume of requests, wait times may vary). Once you receive an email from them, you’ll be able to use your GSM-drivin iPhone on any GSM-based network of your choosing.
The service isn’t cheap, but for those who want a permanent solution for using their iPhone on any network they want, this is the best answer. Their price is actually quite competitive, and it’s on sale right now for $144.99!
This service works for the iPhone 3G, 3GS, 4, and 4S. CutYourSim can unlock any AT&T iPhone, on any iOS version, and any baseband. There is also support in the UK, although there are some conditional requirements you’ll need to meet for it. You can see more details about that on their website.