The Different Cellular

Frequencies in the World

• Different countries use different cellular frequencies in the world.• In US,the main frequency bands in communications are GSM850,

GSM1900, 3G (850/1900 and 1700/2100) and 4G (Verizon USA 4G, Sprint Clearwire WiMAX and T-Mobile 4G).

• You can see the details from the sheet which lists different bands and technologies that the main carriers in the US used as follow(from wikipedia):

• In the table the cdmaone and UMTS mean the different generations of the mobile phone and the different technologies.You can see the different generations in the table(from wikipedia):

• What about the other countries? You may be confused about their differences.You can see the exact informations from the map(from worldtimezone.com):

• In conclusion:• GSM 900 / GSM 1800 MHz are used in most parts of the world:

Europe, Asia, Australia, Middle East, Africa in the blue area of the map.

• GSM 850 / GSM 1900 MHz are used in the United States, Canada, Mexico and most countries of S. America in the yellow area of the map.

• So if I wanna go to China or Europe,is it that my cell phone cannot work according to the situation? Don’t worry.

• Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1800/1900 MHz) or four bands (850/900/1800/1900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones; with such a phone one can travel internationally and use the same handset. • So if you want to buy gsm jammer,you should know that where do

you want to use and what frequencies can the jammer support.Only then can you achieve your purpose. • http://www.jammer-buy.com/gsm-jammer/c-26.html

• 4 bands cell phone jammer from:• http://www.jammer-buy.com/gsm-jammer/p-6958.html