What is Quad Band Wi-Fi ™?

Quad Band Wi-Fi ™ is a wireless technology that supports communication in four different frequency belts on the same device. Many regions of the world use several unique frequency ranges for their mobile phones systems. The four most common bands cover most of the world's networks. Quad Band technology is specific to the global mobile communication system (GSM). Business passengers often use it to allow communication and roaming in different countries with the same mobile device.

GSM Quad Band The phone can use one of the frequency belts for which it is designed on the GSM network. Two of the common frequency ranges of Wi-Fi ™, which cover the largest area, are 850 and 1900 Megahertz (MHz). These groups are widely used in North, Central and South America. The other two GSM ranges are most commonly used 900 and 1800 MHz. They cover a large part of the rest of the world, with 900 MHz most commonly used from both.

Each frequency belt Wi-Fi ™ frequencyIn fact, Wi-Fi ™ contains two ranges. The 850 MHz belt uses 824 to 849 MHz for uplink and also uses 869 to 894 MHz for Downlink. The uplink for the MHz 1900 MHz group is 1850 to 1910 MHz and Downlink is MHz between 1930 and 1990. Downlink for the 900 MHz GSM band is 935 to 960 MHz, while the uplink is 890 to 915 MHz. For the 1800 MHz frequency belt is 1710 to 1785 MHz uplink and 1805 to 1880 MHz is downlink.

Universal Mobile Telecommunications System (UMTS) uses some of the same 14 frequency belts as GSM does. Many multi -band UMTS phones work with GSM networks, but not vice versa. Some phones with multiple modes support both the UMTS and Quad Band Wi-Fi ™ GSM on the same frequency belts. Japan and some other countries do not support GSM networks at all.

TRI band technology supports only three different frequency bands on the same device. A country where Phone is purchased usually determines which three frequencies are included. For example, GSM GSM from North America generally supportsCommon American frequencies 850 and 1900 MHz. It often includes 1800 MHz as the third frequency belt, which provides limited coverage in the rest of the world. On the other hand, the European phone can support local 900 and 1800 MHz and 1900 MHz tapes to partially cover other regions.