Different Operating Frequencies
Repeaters are available for all the different GSM frequency bands, some repeaters will handle different types of network such as multi-mode GSM and UMTS repeaters however dual- and tri-band systems cost significantly more. Repeater systems are available for certain Satellite phone systems, allowing the satphones to be used indoors without a clear line of sight to the satellite.
Read more about this topic: Cellular Repeater
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—William Burroughs (b. 1914)