Each new mobile phone generation improves the technology from the preceding generation. The big difference between a second and third-generation phone goes beyond the kind of subscriber identity module used by the telephone. Information can be downloaded by a 3G phone quicker and with higher security than the usual 2G phone. A 2G SIM card may be the type of SIM card required for use with 2G handsets, and a 3G SIM may be the type of SIM card required for use with 3G handsets. Your subscriber information is contained by the SIM card. Any functions doesn’t be however, controlled by the integrated circuit on the SIM card, on your mobile. The SIM card merely provides a gateway for the apparatus. The SIM card can be only accessed by you if you have the right PIN code, and SIM cards use Worldwide System for Mobile Communications cellular networks. The memory on a SIM card may also store a small quantity of information such as for example your mobile’s contact information.
SIM cards are available in three different sizes: full, miniature and micro. The size specification only influences the actual measurement of the card, perhaps not its functionality. In other words, the size of the SIM card will not influence how the SIM card functions just the apparatus which you can use with the SIM card.
Voice communication was allowed by the first generation of GSM mobile phones (2G NNP CD. The market was originally entered by the second generation of phones using GSM technology in 1991. The 2G technology uses different bands of the GSM spectrum, including Frequency Division Multiple Access and Time Division Multiple Access, to support data and voice transmission. The 2G networks, nevertheless, could not keep up with the increased demand for available bandwidth; data can be transferred by 2G up to 300 kilobits per second supplying insufficient speed for media intensive communications and applications. The 2G technology also uses 200 kilohertz for voice transmission and an A5 ciphering algorithm for security.
The specifications are fulfilled by the standard for 3G mobile phones established by the International Telecommunication Union for International Mobile Telecommunication – 2000. To get a 3G categorization, data must be transferred by the network at the very least of 144 kilobits per second for moving traffic, 384 kilobits per second for pedestrian traffic and 2 megabits per second with no traffic. The 3G uses KASUMI for the encryption of the authentication procedure and the 1.25 megahertz channel for voice transmission.