Airplay Mirroring & Data usage
I Have an iphone 5, appletv 3 and iPad 4. I want to watch my itunes movies already downloaded onto my iPad on my appletv. I have a family share plan with att just for my phone. This share plan also comes with a personal hotspot. I have no wifi connection. If I use my personal hotspot to put my appletv on and iPad to allow mirroring will it eat my data quick? If so Is there a better option I have to not use my data? Would it eat my data if I downloaded the movies to my phone and mirrored them to appletv or is it the same usage as hooking up both appletv and iPad to my hotspot? I have read that if they are already downloaded to your device there is hardly any usage at all. I have also asked a similar question in here and have been told it will eat my data. I just want to find the best way to watch my itunes movies on my appletv with the resources I have. That would be an iphone 5 with personal hotspot, an appletv, and an iPad 4. Reason I post this question is because my previous question was answered in very short and unhelpful fashion. will beg grateful for anyone who has a certain answer and good advice. Thanks Apple Comm.
iPad (4th gen) Wi-Fi, iOS 7.1.1