MOSFET scaling, the rapid miniaturization of MOSFETs at a rate predicted by Moore's law, led to computers becoming smaller and more powerful, to the point where they could be carried. During the 1980s1990s, laptops were developed as a form of portable computer, and personal digital assistants (PDAs) could be used while standing or walking. Pagers, widely used by the 1980s, were largely replaced by mobile phones beginning in the late 1990s, providing mobile networking features to some computers. Now commonplace, this technology is extended to digital cameras and other wearable devices. Starting in the late 1990s, tablets and then smartphones combined and extended these abilities of computing, mobility, and information sharing.