So I went to the Apple store today to get my 6 plus battery replaced under the discount, the genius told me they could not replace it because it had a third party battery and a third party rear case installed that didn't match Apple's serial numbers. They asked if I had replacement parts put in. I told them the phone hasn't had any work done and I bought it new from AT&T. So the question is, are these cell carriers pushing out used refurbished phones and charging full price for them?