Yes, a Sunrise data SIM card generally works with the AVM FRITZ!Box 6850 5G International. Users report that Sunrise prepaid and other Sunrise data cards work with the router, provided the SIM is inserted correctly and the PIN code is removed if necessary. It is important that the Sunrise subscription supports 5G and that the SIM card is suitable for the router, especially for 5G standalone (SA) networks, where a newer SIM (e.g. eSIM) that supports SUCI may be required.

Experience shows that there are no fundamental compatibility problems, but there may be restrictions with some plans or SIM cards, for example if Sunrise recognises usage in the router and throttles the speed. It is advisable to test the SIM card in a mobile phone first and ensure that the PIN code is deactivated to avoid connection problems.

To summarise: With a current Sunrise data SIM and a suitable plan, the router usually works without any problems.

Hello,

In principle, the FRITZ!Box 6850 5G does not make any special demands on a SIM card itself.
It is more important to find out which frequency bands are actually used by Sunrise with the contract you have booked.
You can find out which frequency bands the FRITZ!Box 6850 5G supports here:

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 include the ticket ID #6940526 in your enquiry so that we can allocate your support ticket more quickly.

Kind regards from Berlin
Your FRITZ team

Thank you...