Check through your plan details. "Unlimited Data" is usually XGB of high speed data, after which you are throttled to near dial up speeds. That 200GB was probably an increase to your high speed cap.
Most have some sort of parking mode nowadays. Mine will run for up to 48 hours, though it will shut down early if it detects the car battery getting too low.
Using IE mode in Edge and every time a new window pops up it puts a banner at the top asking me to open it in Edge instead.
I'M USING EDGE YOU FUCKHEADS.