Radios in phones are an underappreciated feature. I just moved and didn't have internet access at my new home and I got a lot of use out of the fm radio in my moto g6 since I didn't want to use up my data.
Most phones have a radio antenna, it's just not a default application feature for whatever reason.
If you're running an android phone, you should be able to enable a radio with little trouble.
A lot of the phones in the US will have a radio but no internal antennae. The radio is only activated when headphones are plugged in as they become the antenna.
For a while you could use apple headphones as an antenna for the FM radio in the iPhone.