In FM Mode, NextRadio uses a wi-fi or cellular data connection to download album art and other enhanced content, but gets audio via the station's FM broadcast. If you do not have an Internet connection, you can still listen to the radio, but you won't get enhanced content. This allows you to receive potentially life-saving information in an emergency when data networks may be down.
In Streaming Mode, NextRadio gets audio as well as enhanced content via the Internet like other streaming "radio" apps.
Is your device FM-enabled? Visit our Supported Devices page to find out.