Can i watch tv through an app called "TVCatchup" on a normal tv without an aerial by using the iphone?

i have a TV in a room without an aerial socket, I use it simply for watching DVD's and playing Xbox. i picked up a cable the other week made by Belkin that allows connection from my iPhone4 to my tv but i wasnt sure if that is to simply view saved photos and videos, or whether i can wacth tv programmes through an app.
As it happens the cable didnt work and a follow-up search online proved that cable doesnt work with iPhone4/4S but the Apple Stores do sell a cable that will work with the iPhone4/4S, so my question as said is; can i watch tv programmes that are transmitted (persuambly wirelessly via my internet router) via an iPhone app, but on a normal tv using the Apple cable?
The cable obviously at one end has the iPhone/iPod etc plug and the other end is the red/yellow/white connectors.
Hope i have caused too much confusion, appreciate your help and feedback.

yeah iphone4 dont support mirror
so if it will work 100% depen on the app in question if it support tvout it will work if not it will not

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