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If your iPhone isn't using WiFi (e.g. cellular data only), then it probably won't find the Tv.
If both the TV and the iPhone are on the same WiFi, it "should" see it.
I'm assuming you're talking about sending the video to it vs. actually trying to sync files 
Disclaimer: I'm using an Apple TV (the set top box, not the service) and a Mac. Your milage may differ.
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