Airplay data usage
I have a mobile cellular router at my cottage with limited data.
i also have a smart tv with Apple TV.
if I AirPlay video that is stored on my phone to the tv, will it use any of my data?
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AirPlay video requires the iPhone and Apple TV to be on the same Wi-Fi network. Will it use that data? Yes, and plenty of it.
Use AirPlay to stream video or mirror the screen of your iPhone, iPad, or iPod touch - Apple Support