Your phone's unlimited data plan isn't really unlimited — this is what you really get
https://www.cnbc.com/2018/07/13/unlimited-data-plan-caps-verizon-att-tmobile-sprint.html
Verizon, AT&T, T-Mobile and Sprint all offer "unlimited" data plans that suggest you can use as much high-speed data as you want each month.
But the truth is more complicated.