Restarting is always a good fallback, but before you get to that point, there are other steps you can take if you're off the ...

Although not explicitly Android security, it’s personal security. There is a whole section dedicated to this in your phone.

T-Mobile's self-service SIM managing tool is back in the T-Life app. Here's how to get it set up and transfer your own SIM cards and eSIMs on your own.