We use T-mobile for hot spots and the van has an ATT hotspot. I've also got a cell phone booster but I haven't decided if it really works yet. Between the two services we always had a connection on our trip to Florida. That's not a very good test though, we weren't ever far from an interstate. T-mobile inked a deal with SpaceX to use Starlink satellites for MMS services. I'm gonna wait and see how that shakes out before I invest in any other data services.
https://www.cnbc.com/2022/08/25/spacex-and-t-mobile-team-up-to-use-starlink-satellites.html
Bruce