SIM-based attack has been used to spy on people for two years
 

In a few cases,your SIM card may pose more of a security risk than your phone's software. AdaptiveMobile Security researchers say they've discovered a new vulnerability, nicknamed Simjacker, that's being used to surveil people's devices by an unname...

https://www.engadget.com/2019/09/14/simjacker-attack/