Why won't videos work on my iPhone?

For some reason my iphone (not anyone else's phone just mine) videos don't work. With YouTube videos, it will load and say, "playback error" and with normal Internet videos the triangle play button will have a slash through it. I've tried five browsers: safari, chrome, mercury, and two others I can't remember. I've tried rebooting, resetting settings, and even erased all content and settings. Help please! My iPhone is basically my official entertainment system. Now it's useless

It sounds like there could be some sort of software missing from the phone, I'd say the best bet would be to take it to a phone repair shop and let them have a look at it.

If it's still under guarantee, you could take it back to the store where you bought it from and they should sort it out for free.

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