Jailbreaking the iPhone 3G 2.1/2.2 enables you to get an access to sounds, themes, games and lets you install a number of other third party applications. You can use MMS, emulators and adult content as well. However, you must make sure that by running the jailbreaking software you are not jeopardizing the warranty of the iPhone.

Jailbreaking your iPhone opens up a world of free applications before you. Applications such as the Terminal and theming which looks nice and adds to the fun are easily available. The homescreen unlocking on a 2.5G iPhone also becomes very easy. This is achieved if you try the method of neutering by performing a completely reversible unlock on the baseband. Unlocking the baseband is somewhat difficult on 3G iPhones and you are dicey even if you happen to unlock the baseband.

Another application which is ensured by the software is tethering. However, you would have to be careful when you use this application because service providers such as AT&T carries out a deep investigation to find out if the users are using this application to violate their plan and may switch you off when they find out that you are indeed using it to violate their plan. However, there is no such threat for users who do it occasionally. Although there are close to 100 companies that promise jailbreaking and iPhone unlocking solution there are only a few who provide a complete solution for the iPhone 3G 2.1/2.2. So, you should make sure that you do a good research of the company from which you intend to get the software.