Nokia Lumia Bring your own phone 520 & 635

Recently bought a 520 and 635 for personal use.
Neither phone will send or receive picture messages.
All other functions work properly.
I have seen others with the same issue, but no one seems to have the same type of directions to correct the issue.
Help, anyone?
Neither phone will send or receive picture messages.
All other functions work properly.
I have seen others with the same issue, but no one seems to have the same type of directions to correct the issue.
Help, anyone?