Here is the diagram review of iPhone 3Gs full back cover assembly parts, from which you will see the full parts included into the iPhone 3Gs back cover. Meanwhile you will get to know where exactly each small part is located.
At the top ot the back cover, it includes iPhone 3Gs headphone jack flex cable, the iPhone 3Gs camera, wifi antenna, the side buttons- power/volume/mute buttons. At the bottom you will see they are iPhone 3Gs dock connector flex which also is named charing port flex cable, the speaker, anntenna.
Please kindly take note proffessional skill is required for the iPhone 3Gs full rear cover assembly or disassembly, so please make it absolutely sure before your DIY. Considering those iPhone end users who are unafamiliar with iPhone repair, Aviso supplies the full back cover assembly set for your easy replacement. What you should do is to upplug the front screen assmembly, mainboard and battery and then re-installed on the new full back cover assembly. That's it.