GSM (Global System for Mobile Communications) is the fastest growing and most advanced mobile technology available today. GSM phones work with a small electronic chip called the SIM card. The SIM card holds the phone number assigned by the service provider, your phonebook and other registration information. GSM operates on multiple frequency bands around the world - 900 Mhz and 1800Mhz, used in Europe, Africa, Asia, Australia and South America ; 850 Mhz and 1900 Mhz, used in the.North America and South America. Different service providers operate on different frequency within the country. For example, T-mobile operates on 1900 mhz in the USA, while Cingular operates on 1900 mhz or 850 mhz. When selecting your cell phone make sure that you select a phone that operates on your service provider's band.
Dual band - Usually are phones that operate on 900 mhz or 1800 mhz. These phones will work around the world but, will not work in North America.
Tri-band - Tri-band phones usually include 900 mhz, 1800 mhz and 1900 mhz band. These phones will work around the world and in the North America. These phones will not work with service providers that only support 850 mhz in your area.
Quad band - Quad band phones cover all the bands - 850 mhz, 900 mhz, 1800 mhz, 1900 mhz. Quad band phones will work all over the world with all GSM service providers.
Unlocked GSM Phones
Unlocked GSM phones are not locked to a specific service provider.Unlocked phones will work with any GSM service provider that is supported by the phone's frequency band. Normally, all the phones sold by the service providers are locked to be used with their service only. For example, a locked phone from T-mobile wouldn't work with Cingular's service.
3G is an International Telecommunication Union (ITU) specification for the third-generation mobile communications technology that was created for high-speed transfer of data and multimedia content, such as video, downloads, music and interactive games. 3G aims to increase bandwidth up to 384 Kbps when a device is stationary or moving at pedestrian speed, 128 Kbps in a car, and 2 Mbps in fixed applications. 3G will work over wireless air interfaces, such as GSM, TDMA, and CDMA. The new EDGE service was developed specifically to meet the bandwidth needs of 3G.
Enhanced Data GSM Environment (EDGE) is a faster GSM wireless service that can deliver data at rates up to 384 Kbps on a broadband. The standard is based on the GSM standard and uses TDMA.
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Simply known as a “cable replacement” technology, Bluetooth is a radio-frequency standard that functions as a personal-area network (PAN). It replaces cable-based connections, like USBs, with short-range wireless connections. The technology can be applied between desktops and notebook computers, handhelds, PDAs, mobile phones, camera phones, headphones, printers, digital cameras, headsets, keyboards and computer mice.