Hello,
Could you tell what is the operator of the SIM you are using?
Also, what type of 5G does your operator support: is it stand alone (SA) or non-stand alone (NSA)?
Could you check if the following has any effect in the case of:
- 5G NSA
- Login to the router's WbUI, navigate to Network -> Mobile -> General and check if Network type is set to 4G + 5G? This is mandatory for 5G NSA operation.
- 5G SA
- Login to the router's WbUI, navigate to Network -> Mobile -> General and set Network type 5G only.
Also, make sure the router is using correct APN. For example, you can check APN your phone receives, when it has 5G SIM inserted, then enter this value in the router Network -> Interfaces -> [mobile_interface_settings] by disabling Auto APN slider button, setting APN option to --Custom-- and entering Custom APN accordingly.
If the above did not help, I would like you to attach a troubleshoot file to your question. Please, replicate the issue, then access router's WebUI, go to System -> Administration -> Troubleshoot section and download troubleshoot file from there. The logs in the file might provide more insight into the issue.
Best regards,