AirVoice Internet and MMS settings for Windows Phone 8

Open cellular settings, in the App list, tap Settings > Cellular.

Select Data connection and turn this On.

Enable Highest connection speed

Tap Add Internet APN

Make below changes to the configuration

APN: att.mvno
User name:
Password:
Proxy server (URL): 66.209.11.33
Proxy port: 80
IP type: IPv4

Tap Save

Done.

Open cellular settings, in the App list, tap Settings > Cellular.

Tap Add MMS APN

Make below changes to the configuration

APN: att.mvno
Username:
Password:
WAP gateway (URL): 66.209.11.33
Wap gateway port:80
MMSC (URL): http://mmsc.cingular.com
MMSC port:
Maximum MMS size: 1MB
IP type: IPv4

Tap Save

Done.