I don't know if this is a 3T or generic Android problem, so I'll start here. About a month ago, I started getting an error message every time I'd go in or out of the built in message app. I've verified that the messages were sent and rec'd despite the error. Have tried clearing cache for message app. Have since updated to 7.1.1 and cleared partition, and the problem persists. I'm not rooted or anything fancy. Can't think of any new apps or anything from around that time frame. I can live with it, but it's darned annoying to hear that beep all the time. Any suggestions?