Most phone with fm radio  come with a built-in FM chip, which can be used to broadcast audio over local radio stations. However, manufacturers and carriers don’t activate this feature on most devices. That’s a shame because the FM radio can be used as a backup for emergencies, when cell and data networks might go down.

Stay Connected Anywhere: The Ultimate Guide to Cell Phones Boasting Radio Tuner Features

To play FM radio on a phone, the first thing you’ll need is an antenna. That can be any wired headphones that plug into your device or even a stereo cable. The FM chip needs a wire to capture radio signals, which is why the headphones or stereo cable act as an antenna. Several apps, including NextRadio and RadioFeed, can check whether your Android device has an activated FM receiver and help you find nearby stations.

The best-known Android devices with activated FM radio include Samsung Galaxy S and Note phones, as well as the Motorola Moto X, ZTE Axon 7 and 8 Plus, HTC One M9, Sharp Aquos Crystal, and OnePlus One. To make sure that your phone has an active FM receiver, download the free NextRadio app from Google Play.

As for iPhones, the only way to listen to FM is with a radio app that requires a working data connection. Apple has refused to enable the FM chips in its smartphones, and it’s unlikely that it will change course now. Until then, it’s worth keeping a set of wired earphones in your bag to use as an emergency radio.