It can run third party applications as well. But thanks to the newly launched Iphone 3g unlock with which one can easily pop out the American At&T as carrier and choose among various other carriers for iphone. This official unlock for the iphone 3G is a Dev team creation .one just need to follow few steps which involved little bit of hacking and can easily pop of at& t as carrier and use different carriers Sim card in the same phone.
Few steps which one needs to follow for iphone 3G unlock are:
1.Up gradation to firmware 2.2
One might have already upgraded iphone with 2.2 versions for iTunes. If not then first step towards unlocking is to install it. After taking backup of iphone and securing all prior notes or data in it, one can just click on update button. Securing data is important as user will loose all prior data on updating the devise.
2.Phone to be PWN
Second step after updating iphone involved downloading. iphone 3G users needs to download quickpwn before making installation. Before unlocking, users will have to jailbreak iphone device. After this iphone needs to be connected to computer with USB and then click on fire up the quickpwn button. The application will keep explaining itself and one just needs to follow instructions. User will just need to select phones firmware and then install installer or cydia. Rest of the process will go automatically while taking few minutes.
3.Repository applications to be installed
Final stage includes installing application repositories. I.e. if cydia is opted as option, then one needs to fire up the application on iphone 3g which is now jail broken. And after that repository application need to be loaded http://apt9.yellowsn0w.com/.