Vic, is your system is for a single carrier? Can you swap SIM cards?
On this trip, we have been in ATT only, Verizon only, and even T-Mobile only areas. My wife and I have dual SIM phones, so we both have T-Mobile and she has ATT and I have Verizon on our second SIMs. We have $10 Red Pocket accounts each on ATT and Verizon (1 Gb data and more voice/SMS then we'll ever use). With the WeBoost inside antenna, we switch carriers at the drop of a phone onto the inside antenna. 1 Gb data works for a few days, and if longer, we have to up our Red Pocket to the next data level for a month.
The other problem we have is that T-Mobile hotspot is now limited to 5 Gb/month (10 Gb with two lines). We use PdaNet+ but it's less convenient than the T-Mobile hotspot.