(STRICTLY U.S.A. USAGE ONLY) These are wireless mobile hotspots, and can be used "on the move". We've tested them on interstates in vehicles, and they work well. This being said, there are definitely times when heading into wooded areas or valleys/mountains, the signal will cut out. However, if you are on open roads with many cell towers around the carrier you are utilizing... then it's relatively steady. Think of our hotspots like your cell phone… you have coverage a lot of the time but not all of the time. We would recommend using it in one place overall, but traveling with these are quite nice. Just don't expect perfect constant signal.