How do I unlock an iPhone?

If you have recently purchased an iphone and are wondering how do i unlock it, you've come to the write place. How do I unlock an iPhone? It's simple just click here and select what iPhone you want to unlock. If you're planning a trip to Europe and rather than paying AT&T to use the networks of its European partners, you want to take advantage of the favorable rates and local phone numbers offered by replacing your AT&T SIM card with a pre-paid European card? Or what if you'd prefer to use T-Mobile as your cellular provider, rather than AT&T?
Yesgeek has the several ways to unlock the iPhone, allowing it to use a SIM card from any provider. (Keep in mind that this is only half the story: the iPhone uses the GSM radio band for its communications, meaning that it'll only work with providers that use the GSM network. In the U.S., that means T-Mobile and AT&T.)