The PC needs to send a special telephone number to the phone to get access to the packet data connection. This allows web browsing on the phone, but a PC can also tap into this service if it connects to the phone. The network can link the data connection into a company network, but for most users the connection is to the Internet. This allows the phone to have a voice connection and a data connection at the same time, rather than a single channel that has to be used for one or the other. The 2.5G networks break both digital voice and data into small chunks, and mix both onto the network simultaneously in a process called packet switching. The release of 2.5G phones with support for packet data changed this. All of these technologies still required their users to have a dial-up ISP to connect to and provide the Internet access - it was not provided by the mobile phone network itself. A further evolution called HSCSD used multiple GSM channels (two or three in each direction) to support up to 43.2kbit/s. The next generation of phones, known as 2G (for 'second generation'), were digital, and offered faster dial-up speeds of 9.6kbit/s or 14.4kbit/s without the need for a separate modem. While some analogue mobile phones provided a standard RJ11 telephone socket into which a normal landline modem could be plugged, this only provided slow dial-up connections, usually 2.4 kilobit per second (kbit/s) or less. A mobile Internet user can connect using a wireless modem to a wireless Internet Service Provider (ISP) to get Internet access. Modem providing Internet access via a wireless connectionĪ mobile broadband modem, also known as wireless modem or cellular modem, is a type of modem that allows a personal computer or a router to receive wireless Internet access via a mobile broadband connection instead of using telephone or cable television lines.
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