What actions on my IPhone 6 use up data in my data plan?

What actions on my IPhone 6 use up data in my data plan? - 1

Leaving the Maps App open while not using it is a big one.

I'm told that if someone face times me, then my data is used up as well.

If you are using up a lot it is probably video (e.g. Youtube, snapchat).

  • Use iphone with no data plan? I currently have a cell phone plan with unlimited internet but it is not a data plan. I would like to use an iphone but not have to change my cell phone plan. Is there a way to do so? I would like to use my iphone safari all the time even if there's no Wi-Fi available.
  • No actions on legacy comments? Ever since a few days ago on YouTube on my iphone 4, whenever I try to reply to a comment, it says "no actions on legacy comments. What in the world does that mean? Is this just some dumb bug that YouTube is having right now?
  • If I use personal hotspot on iPhone, will it use my Wi-Fi or data plan? There are 2 computers in my house. One of them won't connect to the router. So I figure while my iPhone has Wi-Fi access, I can turn on personal hotspot and make the computer connect to the iPhones personal hotspot
  • If i use a Unlocked Iphone 7 on metro pcs can i still use it on my current plan? I want to buy a IPhone 7 unlocked online to use on metro pcs. I already have a family plan 3 phones for 90 a month. If i activate the iphone 7 can i still use the family plan or does the rate go up