: Some Android phones have an FM chip but require wired headphones to act as an antenna. You can sometimes bypass this by using apps that enable the "Speaker" mode while the headphones are plugged in.

: Provides access to both local FM frequencies and digital internet stations.

: A free-to-use option on the iOS App Store for basic FM features. How "Wireless" FM Radio Works

: Marketed as a wireless FM tuner that combines the simplicity of old-school tuners with online benefits. Note that user reviews are mixed, with some reporting it still requires an internet connection.

Turn Any Android Smartphone Into an FM Radio - Mini SDR Review