Allow or block cellular playback for one iPhone app
Use the iPhone’s per-app cellular control to identify a Wi-Fi-only app before changing your subscription or resetting the network.
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Look for the individual switch
Open Settings, then Cellular or Mobile Data depending on your locale. Find the streaming app in the app list and check whether mobile data is allowed. Apple says apps with their individual switch off use Wi-Fi for that service. If a programme works on home Wi-Fi but fails immediately outside it, verify the switch before treating the symptom as an account problem.
Test briefly and restore your preference
If your mobile plan allows it, enable cellular data for the app and try a short programme while Wi-Fi is off. Stop once you know whether playback starts, then restore your usual settings. When an app works only on Wi-Fi after the switch is enabled, record the time and app error. Check the provider’s mobile viewing requirements and use a private support channel for account-specific questions.