Portable Wi-Fi hotspots are, for the most part, great to use and awful to pay for. They're tiny little devices that gives you fast internet access no matter where you are, by tapping into the same fast networks used by Verizon, AT&T, Sprint, and T-Mobile. Until all our laptops have little SIM-card slots in them, this is the best way to get online in places without a Wi-Fi connection. Great! Except it costs an arm and a leg, and requires a contract, and forces you to ration yourself every tiny little megabyte. So, yeah, Wi-Fi hotspots are trying to screw you.