I'll comment on the Verizon (or anyone) "air card" device. We have Verizon phones and their card (which looks like a big thumb drive. We've used it for about 8 years as our only connection to the internet. We don't have wire or cable or anything else to get internet at the house, and even the ATT phone signal isn't good -- ergo Verizon. Since we've had the device and our entire phone contract for years -- we've got an unlimited data ration for our $60/month, and as long as we renew the contract - rather than getting a new one for any reason - we keep the unlimited data. What with babysitting this and another website or two it's not uncommon for us to churn through 10 gigabytes/month. And it's useable, as mentioned above, anywhere there's enough signal to make a phone call. It's what I'm using to post this as we scoot eastward on I-94 in eastern Montana.
It works fine on the salt, too. All of the photos that I've put here over the years have gone up through the card, and when the file is too big to go onto the site - I send those big files to the Photobucket library and then post 'em that way. 5MB file photo? Fine. Those 12-15MB photo files that Pork Pie sends us for the Salt Talks t-shirt? Aircard.
If you want any other information I'll try to answer questions, but for our dollar -- they're great.