Phone
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2008-7-5 9:57:59
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Mobile phones, often referred to as mobile phones, formerly known as mobile phones, mobile, Mobile, is portable and can be in the larger context of the mobile telephone terminals. Currently on a global scale the most widely used mobile phone is the CDMA and GSM mobile phones. In mainland China and Taiwan is most common to GSM, CDMA and PHS (PHS) handsets are very popular, these are the so-called second-generation mobile phone (2 G), they are all digital formats, in addition to voice communications can be carried out, can also Send and receive SMS (short messaging, SMS), MMS (MMS, multimedia messaging), wireless application protocol (WAP), and so on. Phone appearance generally should include at least one LCD screen and a set of keys (part of a touch-screen phone with a decrease of keys). In addition to the typical part of the phone call functions, also includes a PDA, game consoles, MP3, camera, sound recording, camera, GPS and more functional, with mobile phone functions to the development trend of the PDA.
Currently on a global scale the most widely used mobile phone is the CDMA and GSM mobile phones. In mainland China and Taiwan is most common to GSM, CDMA and PHS (PHS) handsets are very popular, these are the so-called second-generation mobile phone (2 G), they are all digital formats, in addition to voice communications can be carried out, can also Send and receive SMS (short messaging, SMS), MMS (technical) | MMS (MMS, multimedia newsletter), wireless application protocol (WAP), and so on.
Phone appearance generally should include at least one LCD screen and a set of keys (part of a touch-screen phone with a decrease of keys). In addition to the typical part of the phone call functions, also includes a PDA, game consoles, MP3, camera, sound recording, video, location and so more functional, with phone features to the Pocket PC development trends.
The first generation mobile phone (1 G) is the analog mobile phone, there are a variety of formats, such as NMT, AMPS, TACS, but basically only for voice communications, the recipient and the effect of lack of confidentiality, the use of wireless broadband is not sufficient. In a second-generation mobile phones after a comparison of these people before the analog mobile phone standard known as the first generation of mobile phones. For third generation mobile communication system (3 G) mobile phone has also been developed, but not universal because the relevant network, has not been widely applied. The beginning of the third generation mobile phones is one of the goals can develop a worldwide wireless communications system, but the actual final result is a wide range of standard, there are WCDMA, CDMA2000 and TD-SCDMA in the competition. These new standards are based on CDMA (Code Division Multiple Access) technology, the use of bandwidth and data communications are further developed.
All the phones to communicate by radio waves, mobile phones and dual-band multi-frequency mobile phone can be used to the same standard of two or three different band phone.
Currently on a global scale the most widely used mobile phone is the CDMA and GSM mobile phones. In mainland China and Taiwan is most common to GSM, CDMA and PHS (PHS) handsets are very popular, these are the so-called second-generation mobile phone (2 G), they are all digital formats, in addition to voice communications can be carried out, can also Send and receive SMS (short messaging, SMS), MMS (technical) | MMS (MMS, multimedia newsletter), wireless application protocol (WAP), and so on.
Phone appearance generally should include at least one LCD screen and a set of keys (part of a touch-screen phone with a decrease of keys). In addition to the typical part of the phone call functions, also includes a PDA, game consoles, MP3, camera, sound recording, video, location and so more functional, with phone features to the Pocket PC development trends.
The first generation mobile phone (1 G) is the analog mobile phone, there are a variety of formats, such as NMT, AMPS, TACS, but basically only for voice communications, the recipient and the effect of lack of confidentiality, the use of wireless broadband is not sufficient. In a second-generation mobile phones after a comparison of these people before the analog mobile phone standard known as the first generation of mobile phones. For third generation mobile communication system (3 G) mobile phone has also been developed, but not universal because the relevant network, has not been widely applied. The beginning of the third generation mobile phones is one of the goals can develop a worldwide wireless communications system, but the actual final result is a wide range of standard, there are WCDMA, CDMA2000 and TD-SCDMA in the competition. These new standards are based on CDMA (Code Division Multiple Access) technology, the use of bandwidth and data communications are further developed.
All the phones to communicate by radio waves, mobile phones and dual-band multi-frequency mobile phone can be used to the same standard of two or three different band phone.
