I am on my second iPhone 4 purely because the original had a bad accelerometer. I don't have the death grip issue in either phone, and I only had the prox sensor issue in the first one after I updated to 4.1. I've kept the replacement on 4.0.2 because of this. This replacement iPhone is perfect. Interestingly, the original iPhone was actually a newer device, the original serial number was 83035, this one is 84034. Again, no deathgrip at all, even with no case, and a perfectly working prox sensor. 🙂