Phones should include an AM/FM tuner. Then you can hear local stations, and if you're out of cell range or things go badly, receive broadcasts.
I couldn't find FM/AM USB-C dongle. My guess is that nobody uses FM/AM or if they do, they get a standalone radio.
Now I have to remember to bring a little pocket one or be sure the old phone is charged whenever I go to sporting events. Really kind of a pain. Luckily the kids also like to play games on the old phone so its a handy distraction machine on the train ride.