Offroad
I don't know about if it's only true for data - we have AT&T for our phone.
We don't video stream, except the occasional YouTube video. The transfer rate for 4G is very fast. Not so much for 3G lol. We rarely use a Windows device, though we have one. IPads. For any updates or large files, public wireless is used. Nothing is ever urgent enough for us that we can't wait a day or so until find a public wifi. Might as well use their bandwidth for the the large files. The device automatically searches of 3G if 4G is lost. May take 30 seconds but it doesn't interfere with what we are doing.
We have looked into extending wifi range, but have done nothing about it. Hasn't been an issue for us. No problems for reception with either our old metal van or our new fiberglass camper. Put it near a glass window.
The device works great for us. We rarely exceed 3 gb a month. If there's no cell coverage, thats OK with us. Go to a public library and download a cpuple of videos on advance. There are larger data programs available if you want to pay the price. Not efficient, for us to pay the extra money.