• A color LCD screen with backlight.
• Enhanced wireless capability such as Wi-Fi, Bluetooth, and infrared and the ability to synchronize with computers.
• A large memory (RAM and ROM) and persistent storage (memory cards or built-in hard disk).
• An advanced operating system with a set of applications that usually include games and calendar, scheduler, address book, media player, book reader, recorder, note, and calculator functions. Many have a camera; some even have a Carl Zeiss lens.
• high-end cell phones by cell phone manufacturers, such as Nokia, Ericsson, and Motorola;
• PDA phones by HP and Palm; and
• enhanced wireless email devices (that is, Blackberry) by Research in Motion.
• Mobile local search. MLS users might want to find information about nearby, specific businesses or friends. Some services combine this with wireless advertising, which sends electronic coupons and special offers only to customers in the vicinity. Google, Yahoo, and Microsoft MSN all provide mobile local search, and numerous companies—such as go2 ( http://www.go2.com) and m-spatial ( http://www.m-spatial.com) —are developing services that can offer more than just a Web search result displayed on your phone screen.
• Mobile social networking. Using cell phones and smart phones for social networking has gained significant traction. Online services such as Dodgeball, http://www.dodgeball.com, (part of Google now) let users send text messages of their whereabouts and pictures to friends and friends' friends who are within a few blocks.
• Location-enhanced asset management. Warehouses, retail stores, and manufacturing plants can leverage indoor location-sensing technologies using Wi-Fi, Bluetooth, or RFID (radio frequency identification) to improve efficiency and productivity of inventory tracking and supply chain management. Ekahau ( http://www.ekahau.com) and Newbury ( http://www.newburynetworks.com) are examples of such systems.
Pei Zheng is a software engineer at Microsoft. His research interests include distributed systems, network simulation and emulation, and mobile computing. He received his PhD in computer science from Michigan State University. He is a member of IEEE. Contact him at One Microsoft Way, Redmond, WA 98502; firstname.lastname@example.org.
Lionel M. Ni is the Chair Professor and Head of the Computer Science Department at the Hong Kong University of Science and Technology. His research interests include high-performance computer systems, high-speed networks, pervasive computing, wireless sensor networks, and distributed systems. He received his PhD in electrical and computer engineering from Purdue University. He is a fellow of IEEE. Contact him at the Dept. of Computer Science, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; email@example.com.