Can you have wifi everywhere?

I have WIFI 2200 from Sprint. It is the hotspot. I have been able to only get one computer to work with it and it was a job. I've tried to get it to work with two printers and another computer and couldn't. (I'm not saying it couldn't be done by someone whose more savvy). It is supposed to work with 5 devices in proximity. It is nice to carry with me when I go on trips though.