Vodafone IT Italy APN Settings for Nokia Lumia 920

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: web.omnitel.it
User name:
Password:
Proxy server (URL):
Proxy port:
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: web.omnitel.it
Username:
Password:
WAP gateway (URL):
Wap gateway port:
MMSC (URL):
MMSC port:
Maximum MMS size: 1MB
IP type: IPv4

Tap Save

Done.