GSM (Global System for Mobile communications) is an open, digital cellular technology used for transmitting mobile voice and data services. GSM differs from first generation wireless systems in that it uses digital technology and time division multiple access transmission methods. GSM is a circuit-switched system that divides each 200kHz channel into eight 25kHz time-slots. GSM operates in the 900MHz and 1.8GHz bands in Europe and the 1.9GHz and 850MHz bands in the US. The 850MHz band is also used for GSM and 3GSM in Australia, Canada and many South American countries. GSM supports data transfer speeds of up to 9.6 kbit/s, allowing the transmission of basic data services such as SMS (Short Message Service). Another major benefit is its international roaming capability, allowing users to access the same services when travelling abroad as at home. This gives consumers seamless and same number connectivity in more than 210 countries. GSM satellite roaming has also extended service access to areas where terrestrial coverage is not available.

INTERNATIONAL GSM COVERAGE

The following shows GSM coverage frequencies for a few major countries. Unlocked phones (particularly quad-band phones) work in all countries where GSM coverage is available. Unlocked phones do not work in countries that offer only 3G newtwork.

Australia: 900/1800

Brazil: 900/1800

Canada: 850/1900

China: 900

Fiji: 900

Guam: 850/1900

Hong Kong: 900/1800

Israel: 900/1800

Japan: 3G

Korea: 3G

New Zealand: 850/900/1800

UK: 900/1800

US 850 (ATT) /1900 (T Mobile)

Tri-Band Phones cover 900, 1800 and 1900 bands

Quad-Band Phones cover 850, 900, 1800 and 1900 bands

We at HOKU1 specialize in Unlocked world phones.

Major barnds such as:
• NOKIA
• MOTOROLA
• SAMSUNG
• SONY ERICCSON
• LG
• Apple iPhone