I have a Galaxy Victory by Virgin Mobile and I use Go Sms pro for group messages. The only problem is my phone will not send MMS messages when I'm on the 4g LTE network. I have tried calling Virgin Mobile, but Go SMS is a third party app and they will not help me. ....... My User Agent is filled in manually and APN is filled in manually... My phone is not rooted .. I don't know what to do because I'm paying for 4g, but i cannot use it because i cannot send MMS ....(group messages convert sms to mms to send to multiple parties).. Any help would be great thanks!