TIM Italy APN Settings for Microsoft Lumia 550

Go to App list, tap Settings Network & Wireless Cellular & SIM

In Cellular, select your SIM card
Select Properties
Under Internet APN select Add an Internet APN

Profile name: TIM
APN: ibox.tim.it
User name: saf
Password:
Type of sign-in info:
IP type: IPv4

Enable Use this APN for LTE and replace the one from my mobile operator

Proxy server (URL):
Proxy port:

Tap Save

Go to App list, tap Settings Network & Wireless Cellular & SIM

In Cellular, select your SIM card
Select Properties
Under Internet APN select Add an Internet APN

Profile name: TIM WAP
APN: wap.tim.it
User name:
Password:
Type of sign-in info: None
IP type: IPv4

Enable Use this APN for LTE and replace the one from my mobile operator

Proxy server (URL):
Proxy port:

Tap Save

Go to App list, tap Settings Network & Wireless Cellular & SIM

In Cellular, select your SIM card
Select Properties
Under MMS APN select Add an MMS APN

Profile name: TIM 3
APN: unico.tim.it
User name:
Password:
Type of sign-in info: None
IP Type: IPv4
Proxy server: 213.230.130.89
Proxy port: 80
MMSC (URL): http//mms.tim.it/servlets/mms
MMSC port:
Maximum MMS size (KB): 2048

Tap Save.