The Lenovo ThinkPad X201 is a powerful, ultra-portable laptop that offers a wealth of security, productivity and Internet connectivity features. One notable feature is the ability to connect to the Internet wirelessly through your cellular network. To enable this feature, the network must be able to locate and uniquely identify you through a “subscriber identification module,” or SIM card. Although not immediately obvious, the SIM card is easily installed through the X201 battery compartment. Writer Bio
