How does this work: data free tv even when connected to a phones mobile hotspot - Dir

#1
Does anyone know how the data free tv stuff works, and how it would know I'm connected to a wifi network that is a mobile hotspot?
I have an iPhone that doesn't have a SIM card that I only connect to wifi with, and only non-mobile hotspot wifi at that. Well anyway, today the power went out so I connected the iphone to a hotspot created by my v20 and when I loaded the DIRECTV app for my nephew I got the "welcome to data free tv" message.
How does the app know this?


This question, "How does this work: data free tv even when connected to a phones mobile hotspot," is about DirecTV channels, programming, equipment, and sports.
 
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