A few days after I got the device, I noticed the squeaking. It's pretty annoying; whenever you grip the phone, it has the plastic-on-plastic sound annoying squeak. I went into T-Mobile and they swapped out the back panel, which seemed to solve the problem. However, I noticed the left-center edge still didn't quite seal properly. A few days later, it started to become squeaky again.
I was about to have the phone completely swapped out--T-Mobile took a new phone out of the box, but I noticed it had the same flaw on the left-center side. I opted not to swap it, since I figured the same damn thing would happen again.
Does anyone else have an issue like this? I'm worried it's not waterproof, and it feels really flimsy for a $650 phone.