The NFL premium app is not working on my iphone 7 plus. It currently has IOS version 15.7.8 which should be enough. Any one experience this or have solutions? Thanks! Kevin

You are correct, if you are talking about this app, compatibility iPhone - requires iOS 15.0 or later.

You need to have good data / service to use the app.

See these Apple articles below:

If you see No Service, Searching, or SOS on your iPhone or iPad

If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Manually update your carrier settings on your iPhone or iPad

Manually update your carrier settings on your iPhone or iPad - Apple Support

Update your network provider settings manually on your iPhone or iPad

Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)

If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart

If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart - Apple Support