Originally posted on: http://geekswithblogs.net/mrad/archive/2013/06/17/stright-talk-nokia-lumia-920-mms-fix.aspx
that showed
"Get media content now (1KB)" and then upon selecting the message would get "Media content not available"
here is the fix:
1. go to "Settings / cellular / edit mms apn" and make sure you got this
MMS APN: att.mvno
User name: leave blank
Password: leave blank
WAP gateway (URL): 66.209.11.33
WAP gateway port: 80
Btw,
here are the Interned settings for "edit internet apn"
Internet APN: att.mvno
User Name: leave blank
Password: leave blank
Proxy server (URL): proxy.mvno.tracfone.com
Proxy port: 80
Password: leave blank
Proxy server (URL): proxy.mvno.tracfone.com
Proxy port: 80
video from Mark (http://thenokiablog.com)