Why won't videos play on my iOS device?
If you’re having trouble playing a FOX video on your iOS device (iPhone, iPad, iPod touch), this could be because you have a “jailbreak” installed. A jailbreak, or similar modifications, can alter the device’s operating system, which can impede a media’s playability.
You should make sure that your iOS-powered device hasn’t been modified with a jailbreak. If one has been installed, you should remove it and restore your device to factory settings to ensure an optimal viewing experience.