Ubuntu Touch OS APN Settings

In the Ubuntu Touch OS Open the Settings app.
Navigate to Network → Cellular -> APN Settings.
If no APN is listed, tap Add APN.
Enter the APN details based on your mobile network provider

Ubuntu Touch OS APN Settings

APN : (APN of your SIM Service provider)
Username: (Leave blank if not required)
Password: (Leave blank if not required)
MMSC: (For MMS services)
MMS Proxy: (If required)
MMS Port: (If required)
Authentication Type: PAP or CHAP
APN Type: default,supl,mms

Tap Save and restart your phone.