China Wholesale Quad Band Cellphones

Today, most cell phones support multiple bands as used in different countries. These are typically referred to as multi-band phones. Dual-band phones can cover GSM networks in pairs such as 900 and 1800 MHz frequencies (Europe, Asia, Australia and Brazil) or 850 and 1900 (North America and Brazil). European tri-band phones typically cover the 900, 1800 and 1900 bands giving good coverage in Europe and allowing limited use in North America, while North American tri-band phones utilize 850, 1800 and 1900 for wide-spread North American service but limited world-wide use. A new addition has been the quad band phone, supporting all four major GSM bands, allowing for global use.
There are also multi-mode mobile phones which can operate on GSM as well as on other cellular phone systems using other technical standards or proprietary technologies. Often these phones use multiple frequency bands as well.