Batteries naturally get warm during use, but the issue becomes serious once internal temperatures reach about 194F (90C).
Assuming your phone is on and online, you should be able to see its location on a map. From there, you can make it ring, lock it, set a lock screen note to tell whoever has it how to get it back to ...
Producdevity shares a few examples, and beyond just benchmarking apps, these days some phones also try the same trick with ...