Sent from my SGH-I997 using xda premium
Delete user name and password, change mms proxy to 18.104.22.168. Change apn type to say default,supl,mms Menu>save> reboot. This should allow mms and most likely fix issues. I highly suggest everyone try this. It has helped a lot of people having apn issues. I have screenshots posted in the q&a section.
Sent from my SGH-I997 using XDA