Question

What is the range of frequencies provided by most mobile carriers?

Answer 1

These are,

GSM 900 / GSM 1800 MHz are used in most parts of the world: Europe, Asia, Australia, Middle East, Africa.

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

Answer 2

Most mobile carrier stations use the 800 MHz frequency band. In fact , one can find both AMPS and IS-95 networks in use on the same frequency in the same area that use different channels to carry data. The actual frequency used by a particular phone depends on the settings of the carrier's base station.