Our data plans are like this:
Verizon 4G LTE JetPack for $50 a month = 5GB month then overage charge. (tax deductible) We also have an external antenna for the RV *IF* we happen to be somewhere where the signal is marginal.
AT&T 4G LTE (company paid phone) = 5GB month, then slows to .5GB (that's equal to a half T1, which works fine for remote work! Never any overage and company does not care if we use 20GB on the data plan)
T-Mobile 4G LTE runs about $140 a month and we get 3GB on each phone and 1.2GB on my tablet before it slows down. No overages. But when it slows down, it is almost unusable.
Any of these, or a nearby wifi signal can be "repeated" by my Linksys WRT54GS wireless router (mounted in the RV) and then bridged to a local virtual wireless access point. This allows me to take even a weak signal an bump it up so that we have a great connection throughout the RV and outside within about 150 feet.
Most of the time, I use the company phone, because when it hits the 5GB limit and slows down to .5GB, it is still PLENTY fast for remote work.
When we are on the road (in motion), the Verizon JetPack is often the best source. But we have to monitor it and NOT go over the 5GB limit.
T-Mobile... well, coverage is really crummy, so they don't get used much, but we've been with them for so long and the price is hard to beat. Plus each device doesn't SHARE the data plan.
Oh, an our granddaughter's phone is on it too.
Tina + Dutch and Bell, Bobo, Harley, Buddy (the dogs)
2011 F350 Lariat 4x4 DRW SuperCrew 6.7L (B&W setup w/Air Lift 5000 Ultimate)
2014 Columbus 365RL (Airflex and Voyager package)
Nights Camped 2014 - 154
, 2015 - 32, 2016 - 4