Boost or US Mobile are the new Mint. Think Boost actually has a chance of hanging around for a while since they are owned by Dish who is building out their own network of towers (think they just hit coverage of 70% of US). They also use both T-Mobile and AT&T for roaming with their rainbow sims, which is extremely rare. US Mobile is a Verizon MVNO… their “unlimited” package has the same priority as post-paid Verizon customers for the first 30gb each month, but I’m afraid they’re eventually going to get bought out by Verizon ala Mint.
Many (if not most) new cars have their own cellular service built in. They spin this as being able to hotspot to your vehicle if you pay for data or being able to remote lock/start your vehicle with their app. However, the vehicle manufacturer has their own plan allowing them to relay back telemetry data regardless of whether you buy a data package.