Read those advertisements carefully, most of them are for "stationary" satellite internet, not for "mobile" internet. Or, they could be for TV coverage. There are only a couple of major mobile internet satellite providers, HughsNet, Starband, and IDirect. I had a MotoSat internet dish on my coach for many years with internet service from HughsNet, and it served me well. I was able to have internet access anywhere where I could see the southern sky.
Now, with the advent of better 3G/4G service, many of the former satellite users have switched to wireless internet with Verizon, AT&T, or others. And, I have to add myself to this group.
And, if you start looking at wireless services, be sure to check out Millenicom. They are resellers of Verizon, AT&T and Sprint data services. They offer more band width for less dollars per month than the major wireless providers.