iPhone was replaced at the Apple store the next day. Lost call history, photos, etc., but kept the same SIM, #, and billing info. I had backed up a couple of days prior, so didn't lose all photos, and call history wasn't worth restoring for. I did have to setup mail, calendars, and contacts again, though.
So far, no problems with this phone. Still gets warm, battery performance is about the same. Only positive is that an issue with my original seems to be fixed now. If I last used iPhone with wifi, then again several minutes later when no wifi was available, I have to switch in and out of airplane mode to force a connection.