My Inc worked well for about the first-ish month. I sometimes had "muddy" call quality and the caller would drop in and out (to the point I thought they hung up, but I would start hearing them again). I attributed this to the caller's device/network and not my device. I went from noticing this just a few times, to almost all calls have the problem now, to some degree. It does not matter if using the ear or external speaker. GPS through the speaker is perfectly clear and so is playing movies and music. This suggest it is not an audio output problem, but an actual voice call problem. It is getting so bad that I am beginning to dislike the Inc, since phone calls are obviously a critical function of the device. Everything else works fine.