How to detect IMSI catchers ? (in 2025 with a laptop or a cellphone,SDR)

Questions
1

Hi.

I have access to a HackRF One SDR, Android phones, and various laptop hardware.

I would like to detect an IMSI catcher, but the method I saw posted online are very old. My threat mode is related to foreign interference-spying.

PS: This is for the Canada, we have no 2G and 3 is shutting down.

Thanks for your input.