iPhone 2.0′s official carrier is AT&T. However, not all individuals are satisfied with AT&T or they simply want to choose the same carrier that their family and friends and using. That is no longer a problem because the 3g iPhone can now be unlocked. By unlocking the iPhone, you’re free to choose the carrier.
There are lots of carriers all over the world aside from AT&T. Once your iPhone is unlocked, you can keep using the AT&T network or you can use other carriers like Verizon, T-Mobile, Vodafone, Fido, Telefonica, Tracfone O2, Tim, Rogers, DiGi, Oi, Swisscom, Cellone, Telenor, Si Mobile, Cellcom, Starhub, Optimus, MoviStar, etc.
