If I create a Personal Hot Spot Wi-Fi (on an iPhone 8 with iOS 12.1.3), connect an Apple TV 4k to that Wi-Fi, will I incure mobile data usage if I airplay to the Apple TV using previously downloaded iTunes movies on the iPhone?
IOS – Airplaying: consumption of mobile data
airplaycellular-dataios
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Best Answer
As you are not on a WiFi network, data will be used to transmit the signal.
(Source)
As you have the move downloaded the data consumption will be reduced but data will still be used.