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The lack of memory on the 3G is going to keep it from working, and unlike the 3GS, Apple no longer supports the 3G. If you hop in your time machine and go back to 2010, Apple tried to update the 3G with iOS, you will see that it did not go well, and many of the feature of iOS 4.0 were dropped for the 3G. It is possible on a 3GS which is the oldest supported iPhone, but I'm not sure that it is worth doing due to the dated hardware of the 3GS.