Videos not playing on my iPhone?

I have a iPhone 4S. The youtube videos won't play it just shows the swirling circle on the black screen. It also shows thy on my dailymotion app and the videos won't play.

I don't know what's happening. What should I do?

Added (1). I'm using the Wi-Fi at home

How are you connecting to YouTube - via Wi-Fi or a mobile network? If the latter does it handle video? Does your plan allow for video streaming? Is there a monthly limit on the amount of data you can access and you have reached that limit?

I don't have an iphone, but you might aswell reset it: P

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