How to watch videos from iPhone to tv?

Ok so I got a composite cable to connect my iPhone to my tv to watch stuff like bbc iplayer and sky go and live streams but when connected I only get sound no picture. It works fine when playing videos from apple default video app.
So how can I get other video apps to work?

I know this probably isn't the answer your looking for although i thought i'd include just encase its any use. A friend of mine plays all his videos from his iPhone to his TV however he uses "Apple TV" if you've not heard of it, it may surprise that its not a TV. Its a little black box that you connect to your TV it costs £99 i think. Its really quiet good tho can access store on it as well. Other than that i'm not sure… I know a lot of the android phones have mini hdmi slots now but i'm almost 100% sure that iPhone's don't have hdmi on them.

If that was any use let me know.

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