Hello,
the FRITZ!Box 5690 Pro cannot establish a mobile connection with a normal SIM card without further ado.
You can set it up with a mobile phone stick as follows. Please pay attention to the requirements.
* [Set up FRITZ!Box on the mobile phone connection]
(
https://fritz.com/service...)
If you have any further questions or require assistance from our technical support team, please contact us by e-mail at fritzhilft(at)avm(dot)de. Please state the ticket ID #6953405 in your enquiry so that we can allocate your support ticket more quickly.
Kind regards from Berlin
Your FRITZ! team