An aircard that most people are discussing here is a product made by Sierra Wireless. It is essentially a wireless modem that uses GPRS techonology for a connection. So, it uses current GSM networks for the connection. So, depending on your location/market/providers, you can get a 56K internet connection wherever you get cell phone signals. So, if you need an internet connection and no HotSpots or other high-speed WiFi connection is not available then the “aircard’ can provide you with decent speeds when you need it.