So, about a month ago, my phone was getting so hot. I brought it to Best Buy and they replaced it. Now, the other day, I was downloading a game (over 1 GB) and I was only on a data connection (on vacation) and I took a nap. When I awoke, the phone hit more than 152 degrees!!! I didn't think this phone could go above 131 degrees. I even took a screenshot. Anyway, since then, whenever I am not connected to Wi-Fi, the phone gets really hot. Is it possible that my battery has been the culprit all along?