I have tried multiple apps and reinstalling the apps, they work perfectly fine over Wi-Fi and as I can't connect to wifi while I'm out that isn't an option but I haven't tried streaming directly from the websites.
Thanks for getting back to me. Do you have the settings on your phone set to not allow apps to connect to your mobile data (WiFi only)? If you have the "Restrict Background Data" applied on an app, it will only connect via WiFi.
Please let me know if live streaming from the radio website works for you.
Virgin Media Forum Team
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