Working principle of the cell phone is as follows

Working principle of the cell phone is as follows: the cell phone jammer connects with base station through the radio wave with the specific baud rate and modulation mode within the specified frequency range to complete transmission of data and voice.

The mobile communication has the following general standard in the world wide:

1) GSM: specification of aerial interface is as follows:

Parameter, specification 1 (GSM 900), specification 2 (DCS-1800), specification (DCS-1900)

Backward channel frequency: 890~915MHz 1710~1785MHz 1880~1920MHz

Forward channel frequency: 935~960MHz 1800~1880MHz 1950~1990MHz

Rate of modulating data: 270.833kbps 270.833kbps 270.833kbps

Modulation mode: GMSK GMSK GMSK

Channel interval: 200KHz 200KHz 200KHz

Frame length: 4.615ms 4.615ms 4.615ms

Types: cellular TDMA; cellular TDMA; cellular TDMA.