Exact steps to edit the apn settings: 1) sudo stop ofono 2) sudo vi /var/lib/ofono/<IMSI>/gprs remove all context's except the one named "ATT Phone". Should look like this after you are done:
[Settings] Powered=true RoamingAllowed=false
[context1] Name=ATT Phone AccessPointName=phone Username= Password= Type=internet Protocol=ip MessageProxy=proxy.mobile.att.net:80 MessageCenter=http://mmsc.mobile.att.net
3) sudo start ofono (or reboot)
Now MMS recv should work on AT+T network
Exact steps to edit the apn settings: ofono/< IMSI>/gprs
1) sudo stop ofono
2) sudo vi /var/lib/
remove all context's except the one named "ATT Phone". Should look like this after you are done:
[Settings] false
Powered=true
RoamingAllowed=
[context1] =phone proxy.mobile. att.net: 80 mmsc.mobile. att.net
Name=ATT Phone
AccessPointName
Username=
Password=
Type=internet
Protocol=ip
MessageProxy=
MessageCenter=http://
3) sudo start ofono (or reboot)
Now MMS recv should work on AT+T network