Mobile broadband card advice needed

[AlphaDog]

A friend is currently living and traveling extensively in a motor home and is using a Verizon card, based on the advice of people here around the first of the year. She's been in a couple of places so remote that she hasn't had service, but, overall it's been reliable, and she's been able to access the internet from some areas where she had no AT&T cell service. (Although that's been better than expected, too, considering some of the places she's been!)