Can SIM Cards Get Hacked? | UpGuard

This report outlines the risks of SIM card compromise — including SIM swapping, SIM cloning, and the Simjacker SIM-toolkit vulnerability — describes common indicators of a hacked SIM (loss of calls/texts, unexpected location changes, account lockouts), and provides practical mitigation and response steps such as using authenticator apps, setting SIM PINs, and contacting carriers immediately.