For the longest time (almost year now), I cannot send MMS when connected to my home Xfinity Now my picture texts (MMS cuz I don't have a choice) just sit there and spin. Sometimes they go through and sometimes they dont. I am not the only one who is having the same issue, based on the Xfinity community forum. What's the fix Xfinity?
MMS was designed to go over cellular networks. You might want to ask your cellular provider how to set up your phone to use WiFi for this.