In order to be able to use mobile internet, it is necessary to make adjustments to your mobile device that depend on the operating system.

You can get the Internet settings for your Android operating system by sending an SMS message with the text "Sett" to the number 1445, or manually as follows:

Select Settings - Connections - Mobile Networks - Access Point Names.
Click on Add in the upper right corner.
Internet is entered in the fields Name, APN, Username and Password.
The other fields do not need to be set, that is, they need to remain empty.
In the upper right corner, press the three dots and select the Save option, which will save the settings and return you to the APNs field.

If you are using the iOS operating system, the manual settings are as follows:
Select Settings - Mobile Data - Mobile Data Network - Access Point Names.
Enter internet in the APN, Username and Password fields.
The settings will be saved after you go back to Mobile data on the top left.

If you want to use the Hotspot option, in that case, fill in the fields in the "Personal Hotspot" submenu.