Fairly common problem since November... Using Google Messenger, works great, but if you do a group MMS with an attachment, like a pic, it slows to a crawl and can take minutes, hours or even days to send and receive, and while that is going on, the app cannot send or receive any other SMS or MMS messages. Stock app works fine, Hangouts works fine... 3rd party apps work fine. This is pretty much limited to the Google Messenger app. Updates haven't fixed it. Some say that changing APN settings can fix it, but VZW doesn't allow you to change any of those. Any know how to get this to work?