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This guide assumes that you have already installed Linux on your Cosmo using the [[Linux for Cosmo]] guide.
The current Debian/KDE image uses NetworkManager to handle WIFI and mobile data connections, but mobile data is not working correctly when using it under Cosmo. In order to enable mobile data we have to remove NetworkManager and use connman instead. Connman is an alternative connection manager software, which will be used to handle both mobile data and WIFI connection. As connman integration is in KDE is not as seemless as NetworkManager it is suggested to proceed only if you need mobile data under Linux. Please note that Linux expects the SIM to be inserted in slot 0.
====1 - Install connman====
<code>sudo apt install connman cmst mobile-broadband-provider-info ofono-scripts</code><code></code><br /><code>sudo apt remove network-manager plasma-nm</code><br /><code>sudo reboot</code>
====2 - Enable Roaming====
Roaming needs to be explicitly enabled beforehand if needed. To enable roaming type this command in a terminal:
<code>/usr/share/ofono/scripts/set-roaming-allowed</code>
====3 - Configure APN====
The next step is to configure the APN for your specific network operator, which can usually be found online or by contacting your operator.