GSM networks operate on frequency 4. Most of the works in 1800 Mhz and 900 Mhz. Few countries in the Americas, the 850 Mhz and tape use 1900 Mhz 900 Mhz and 1800 Mhz by the ice in this place has been used before. And the extremely rare that the network would use the 400 Mhz or 450 Mhz frequency only in Scandinavia use due to other bands have been allocated for the other
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