Matthew Becker1
New member
When you swap carriers, MMS settings will likely need to be changed manually. Here's the Internet and MMS info for AT&T (LTE):
Mobile Phone Carrier Settings for AT&T (LTE) - United States
(manual instructions for Windows Phone 8 are on the bottom of the page).
Mobile Phone Carrier Settings for AT&T (LTE) - United States
(manual instructions for Windows Phone 8 are on the bottom of the page).