My phone is always on WiFi unless I am in my car driving from place to place. I use under 2GB a month, closer to 1GB most months. I can't even comprehend how you would use 100GB of data on a mobile device in a month. My primary internet consumption is sitting at a computer all day long, or a laptop on the couch. The mobile data is just for traffic, slack, email, and news. All my podcasts are downloaded on WiFi, all my music is as well. There is just no reason for me to use any real amount of data while not on WiFi.