Mobile communications: global trends in the 21st century Pager. A small telecommunications device that receives(and, in some cases, transmits)alert signals and/or short messages. This type of device is convenient for people expecting telephone calls but who are not near a telephone set to make or return calls immediately. It is estimated that there will be 260 million pager users worldwide by 2003. The overall market revenue for paging/messaging is predicted to be S11.92 billion in 2005 (Wireless Week, The Future of Paging, Oct 1999)[12] 3.2.2 Wireless computing Wireless computing or Wireless Local Area Network (WLAN) is the technology that enables a user to receive information such as e-mails and files directly from the internet or any networks to one's laptop, without the sender's knowledge of the serving network IP address, which may be a wireless LAN. The technology allows for the rerouting of information to the served network for wireless computing just as it does for mobile data services based on 2.5G and 3G technologies For this application, there are two competing technologies in this field; Bluetooth and Bluetooth. An open specification for seamless wireless short-range(less than 30 feet) communications of data and voice between both mobile and stationary devices For instance, it specifies how mobile phones, computers and PDAs interconnect with each other, with computers, and with office or home phones. The first generation of Bluetooth permits exchange of data up to a rate of 1 Mbps, even in areas with a large amount of electromagnetic disturbanc Wi-Fi(802. 11b) Provides for wireless Ethernet transmission primarily between aptos or PDAs and local access nodes that attach to a standard corporate Lan Todays 802. 1lb products transmit in the unlicensed spectrum at 2.5 GHz, and are capable of speeds of up to 11 Mbps. This standard, despite higher speed, is not litable for mobile applications or moving devices 3.2.3 M-commerce M-Commerce is the use of radio-based wireless devices such as cell phones and PDAs to conduct business-to-business and business-to-consumer transactions over wired web-based e-commerce systems [13]. This application should be seen as a complement of existing e-commerce, which focuses on different groups of customers. Nowadays, we might see examples of m-commerce in forms of m-banking, m-payment and latest, e-vending[14Mobile communications: global trends in the 21st century 75 • Pager. A small telecommunications device that receives (and, in some cases, transmits) alert signals and/or short messages. This type of device is convenient for people expecting telephone calls, but who are not near a telephone set to make or return calls immediately. It is estimated that there will be 260 million pager users worldwide by 2003. The overall market revenue for paging/messaging is predicted to be $11.92 billion in 2005 (Wireless Week, ‘The Future of Paging’, Oct 1999) [12]. 3.2.2 Wireless computing Wireless computing or Wireless Local Area Network (WLAN) is the technology that enables a user to receive information such as e-mails and files directly from the internet or any networks to one’s laptop, without the sender’s knowledge of the serving network IP address, which may be a wireless LAN. The technology allows for the rerouting of information to the served network for wireless computing just as it does for mobile data services based on 2.5G and 3G technologies. For this application, there are two competing technologies in this field; Bluetooth and 802.11b or Wi-Fi: • Bluetooth. An open specification for seamless wireless short-range (less than 30 feet) communications of data and voice between both mobile and stationary devices. For instance, it specifies how mobile phones, computers and PDAs interconnect with each other, with computers, and with office or home phones. The first generation of Bluetooth permits exchange of data up to a rate of 1 Mbps, even in areas with a large amount of electromagnetic disturbance. • Wi-Fi (802.11b). Provides for wireless Ethernet transmission primarily between laptops or PDAs and local access nodes that attach to a standard corporate LAN. Today’s 802.11b products transmit in the unlicensed spectrum at 2.5 GHz, and are capable of speeds of up to 11 Mbps. This standard, despite higher speed, is not suitable for mobile applications or moving devices. 3.2.3 M-commerce M-Commerce is the use of radio-based wireless devices such as cell phones and PDAs to conduct business-to-business and business-to-consumer transactions over wired, web-based e-commerce systems [13]. This application should be seen as a complement of existing e-commerce, which focuses on different groups of customers. Nowadays, we might see examples of m-commerce in forms of m-banking, m-payment and latest, e-vending [14]: