I have a Samsung Tablet and always take it camping rather than lugging my laptop around.
It does not have cellular, but I just use my phone for a hotspot as others have mentioned.
If you get a tablet with cell, it is the same thing as having another phone line. You will have to pay monthly for it.
I weighed the options when I bought my Samsung Tab3. The extra monthly charge was a deterrent.
I have occasionally run over my data limit, but the additional cost of that is far less than a monthly fee for cell service in a tablet.
I am happy with my decision, it works very well. Hotspot is built in to most of todays smart phones. No need at all for any extra hardware.