At what frequency do cell phones operate at? What wave frequency?
155605
CELLULAR PHONES OPERATE AT ABOUT 850 MHZ.\n\nPCS PHONES OPERATE AT 1800-1900 MHZ.
1048363
This is a common problem with wireless routers and cordless phones. Many phones use a 2.4ghz frequency which is the same frequency as most wireless routers. Basically the only way to fix the problem is to replace your cordless phones with newer ones of at least 5ghz.
722141
Microwave is any electromagnetic wave with "frequencies between 300 MHz (3 x 108 Hz) and 300 GHz (3 x 1011 Hz)."(1)\n\nThe most common impact could be seen in Microwave Ovens where food is heated up by causing the molecules in it to vibrate so fast, it heats up.\n\nIt is also used in radio broadcasting, radars & Wireless LAN protocols (e.g. Bluetooth). GSM mobile networks & cable TV use microwave.\n\nMicrowaves are used in maser, a device similar to laser, just that it operates at microwave frequencies.\n\nMore at: http://en.wikipedia.org/wiki/Microwaves
489817
Some where around 300 ghz. Go to www.hamlink/freq.list.html
574269
John O's answer is pretty good, except that microwave frequencies have a harder time travelling a far distance compared to lower frequencies.  \n\nHowever, a lot of people said that cell phones use satellites, and that's simply wrong.\n\nAnyway, it's not only cell phones that can interfere with instruments, but any electronics.  I've read where a handheld calculator would skew the instruments when the buttons were pushed.  That's why you can't have any electronic device on when the plane is taking off or landing, not just cell phones.  As far as the limits for getting a signal, I don't think it's well known because no one has really tested it.  The towers have been tested and are designed for terrestrial use, and the conditions are much different (besides the lack of objects such as hills, trees, and buildings, there is the excessive speed at which you're moving in an airplane, which would make it very difficult if not impossible for your call to be transfered from one tower to another, which would explain why the pilot above said the calls get dropped quickly).
214904
normally they work with antennas, electromagnetic fields propagation and communications systems. It has to do a lot with electrical signals and electrical behavior of components in the high frequency spectrum (normally above 9MHz, but radio signals of a few KHz might also be of interest)
752428
Generally from 20 - 20,000 HZ depending on the individual. We lose some high end range as we age
957609
GSM uses TDMA (time domain multiplex). I believe it can handle 8 conversations per frequency channel.
363414
it uses mobile wireless communication to communicate with other modems/receivers. It operates through GSM frequency, the same frequency GSM mobile phones use.
400150
The range of frequencies that humans can hear is approximately between 20 Hz and 20,000 Hz.
927477
60 times a second or 60 Hertz is correct.\n(In Canada it is 50 Hertz)
649390
If you have a device that is sensitive to the frequencies used by cellular phones, then, yes, you can detect them with some degree of accuracy, as long as the phone is on.\n\nTry a device like http://www.globalgadgetuk.com/detector.htm, or do a search for cell phone detector (I'm not sure how legal these are in the US). They'll also give you some cell phone jammers, although jammers are illegal in the USA
189047
Radio waves store the information in the amplitude and frequency of the wave.\n\nIt is similar to how the voltage in a computer to create the 1s and 0s that make up the information you see on the screen.
339135
first one is quite correct but frequency is in per second\n\n47 waves/min = (47/60)Hz   (1 Hz= 1wave/sec)
106067
Cell phones, no matter what technology, use a paging channel with which they detect nearby cellsites and establish communication through control channels, which deliver synchronisation info. The control channel also establishes calls and manages the phone handovers to other cellsites.
79854
YOU HAVE TO BE WITHIN A CERTAIN RANGE OF A CELL TOWER. IF YOU ARE TOO MANY MILES AWAY, YOU WILL NOT HAVE A SIGNAL.  MANY PEOPLE THAT LIVE OUT IN THE COUNTRY CAN'T EVEN USE CELL PHONES/
682558
It is impossible to give the simple answer for which you seem to be searching.\n\nThere are many frequencies which could be used to cover that distance.\n\nI recommend you read about radio communication in general and about h.f., v.h.f. and u.h.f. communications in particular.