by 
The Curious Bag
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A cell phone repeater is a device used to improve cell phone reception, most often in a specific building. Cell phone repeaters are used in areas that lack network coverage of cellular broadcast towers.
Features
Cell phone repeaters use a reception antenna, an amplifier and an internal broadcast antenna to rebroadcast cell phone signals in an area.
Function
Repeaters use an external directional antenna to collect a strong cellular signal and transmit it to an amplifier, which retransmits the signal for a stronger connection.
Significance
Cell phone repeaters are becoming more popular with the increased usage of cell phones. They provide coverage, even in areas that lack broadcast coverage from cellular towers, or in buildings that may block signal strength.
Benefits
Because cell phone repeaters use less power to broadcast a signal, their usage can extend cell phone battery life and reduce radiation levels.
Types
Cell phone repeaters are available for multiple GSM frequency bands. Some operate under multiple frequency bands and repeaters are available for satellite phone systems.
Source:
squidoo.com: Better Cell Phone Reception
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