Please note that the APN configuration differs depending on the manufacturer and operating system.

You can find detailed instructions for the most common devices here:
https://www.helpforsmartphone.com/public/en/devices/ under "Setting up Internet".

The configuration settings are mostly similar on Android devices:

Android

1. Settings
2. Network & Internet
3. Mobile network
4. Additional Settings
5. Access Points (APNs)
6. New APN (+)
7. Edit access point

What is the access point name (APN) of our SIM cards?