Chasity Miller

What carrier is the phone currently on? and what model, you say iPhone 6 but you picked iPhone 6S, which one?

No they are not compatible. iPhone 4S, iPhone 4 CDMA and iPhone 4GSM are all 3 different

Without the power button you might have to wait for the battery to die

Hard to tell from your picture but it looks like one of the rubber feet that go on the bottom of the screen legs. See pic.

No the cover does not affect the camera quality, its just a piece of glass. You might want to try and clean the camera lens with a q-tip. If that doesn't help then the lens itself might of gotten scratched with it being exposed.

Yes that cable is part of the right antenna. Available on eBay: http://www.ebay.com/sch/i.html?_odkw=ipa...

I would try closing all your apps and then hold the power & home button at the same time till the device shuts off and reboots.

Does sound like an issue with the charging port. Have you tried a new charger and cleaned the charging port on the device to make sure? The S3's are known to have charging port issues so this is not surprising, but unfortunately with this model it does require soldering and not an easy DIY job.

Are you sure its a battery issue? Does the device show its charging when you plug in a charger?

Its possible but its going to require some good technician skills, hot plate or heat gun and a thin wire called Molybdenum Wire. Its not going to be an easy job for a novice and you could take a chance of damaging the force flex sensor, another part not available for purchase right now. I would say having apple replace the device is the best solution till more parts become available or wait.

Is the touchscreen & the LCD 1 piece? or are they separate?

This is not a rear facing camera connector. This is the connector for the lHeadphone Jack/Speaker Assembly