No, you do not need wi-fi.
Minecraft PE does not have WiFi games at the time of writing.
You have to Port-Forward it
If you want to connect to a Minecraft server on the PC you will need some sort of internet connection to connect to the server. On the Xbox, you will need internet,as well as a Gold Subscription, to invite others to your map or join someone else's map On mobile devices, you must connect them both to the same WiFi network to play together on a world
There are a lot of hunger games servers, just look them up. One example though (and the only one I can think of at the moment) is mc-hg.com
Why question construct well you do did.
allot of data but not on wifi
Yes, you need wifi to FaceTime.
Yes you do need wifi
You need Wifi to do anything on YouTube.
Yes you need WiFi
You only need WiFi if you are downloading new books. Books already downloaded do not need wifi