I have owned a LOT of phones during my time, and I have never left one stock. Stock is........boring...lol.
I just swapped the back cover to a clear glass one on my 4s and it looks awesome.
The only thing I noticed is that their is a small contact that touches what is either an antenna or EMI shield on the inside of the rear cover (OEM, not the one I put on). You can see the small gold contact just below the "i" in iPhone. It is screwed down to the battery connector.
I will have to do some testing to see what that affects now that it's not doing anything.
I just swapped the back cover to a clear glass one on my 4s and it looks awesome.
The only thing I noticed is that their is a small contact that touches what is either an antenna or EMI shield on the inside of the rear cover (OEM, not the one I put on). You can see the small gold contact just below the "i" in iPhone. It is screwed down to the battery connector.
I will have to do some testing to see what that affects now that it's not doing anything.