Basic information about 4G Technology


4G technology is also called the 4th generation of wireless communication technology after the 3G. It offers much more speed than 3G services. The services provided in 4th Generation communication systems are mobile web access, VOIP, IP telephony, Games on Demand, Cloud computing, and high definition video services. There are two 4th Generation systems currently deployed commercially they are

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Overview of 3G Technology


3G is an acronym of 3rd (Third) Generation mobile networks. It is also known as WCDMA which is an acronym of Wireless code division multiple access. 3G technology supports both voice and data. 3G speed rates are up to 2 Mbps and later it is extended to 21 Mbps (HSPA) and 7.1 Mbps (HSDPA). It is mainly designed for multimedia application such as VOIP, Video calling, Movies on Demand, Games, and many other internet services. This technology is also called as Mobile broadband or WCDMA.

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SIM Card and its functions


The full form of SIM is Subscriber Identity Module. SIM card is small memory card containing the information about various network settings and information such as the mobile number and its Key for GSM and CDMA. It also holds text messages and contact details. It has to be inserted in the GSM/3G/LTE handset to work. Depending on the size of the chip there are different types.

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