Before discussing how to http://unlockiphonesolution.com/jailbreak-iphone-3g-21-22.html”>jailbreak iPhone 3G, remember, there’s a world of difference between jailbreaking and unlocking a cell phone. Unlocking is a process whereby you bypass the SIM lock on the iPhone 3G, which allows the use only of SIM cards allowed by pre-approved network providers. These network providers have a deal with Apple which bars the use of third-party SIM cards.
Jailbreaking, on the other hand, breaks into the iPhone’s file system to modify the user interface so that you can install third-party apps.