Yes, you can generally put your SIM card in a 5G router, provided the following conditions are met:

Compatibility: Ensure that your SIM card and the 5G router are compatible. Check that the SIM card is from a carrier that supports the 5G network and that the router supports the same frequency bands as your carrier.

SIM Card Size: Make sure the SIM card fits the slot size in the router (nano, micro, or standard).

Data Plan: Ensure your data plan supports 5G connectivity. Some plans might be limited to 4G/LTE, so you may need to upgrade your plan.

Network Settings: After inserting the SIM card, you may need to configure the APN (Access Point Name) settings in the router's interface to match those provided by your carrier.

By following these steps, you should be able to use your SIM card in a 5G router to access high-speed internet.