If you're having trouble streaming iHeartRadio on your iPhone or iPad, try these steps:
 

1. Power down your phone for 30 seconds, often this will correct most issues.
2. Update to the latest version of iHeartRadio from the App Store.
3. Check your network connection. Try streaming a video or opening a website in your phone’s browser. If you’re not able to connect, chances are your connection is too weak to stream on iHeartRadio. Try connecting over WiFi until you change locations.
4. If you’re still having trouble listening to iHeartRadio, try deleting and reinstalling the app from the App Store. Often times a fresh installation will fix any issues.

You can also check out Apple’s troubleshooting tips here.