Wi-Fi does not allow you to access the Internet in places where there is no wireless router or hotspot. Consequently, if you want Internet access in areas without a Wi-Fi signal, you need to rely on the 3G and 4G wireless networks used by mobile phone carriers. AirCard is the brand name used by Sierra Wireless for its USB and Express Card wireless modems. However, many users use the term “air card” generically to describe wireless modems from other manufacturers as well. Regardless of what you call the device, purchasing an air card for your laptop will provide you with email and Internet access almost anywhere you go. Writer Bio
