On what waves does the cellphone work?
143170
They are generaly about 800 mghz. RF \nThink they can go as low as 600 and way up to 2400 mghz.\n\nMicro waves are used in telecomunications but not " in " \nyour cell phone.\nThis picure of a microwave tower has just about every shape \nmicrowave dishes come in. (thows curved things that bounce the microwave signal) any ways they are line of sight \nthat means the dish has to be aimed directly at another dish.  If cell phones used microwave technology you would \ntotaly have to like climb a tower and aim your phone in just the right diection to get a signal.\nany ways heres a pic of a microwave tower\nhttp://www.drgibson.com/towers/bountifulmain.jpg\nit carys lots of conversation over a distance so we \ndon't have to string up more telephone polls everywhere.\nand here is a tower for a cell site\nhttp://wallybloss.com/images/22Cell_SIte_Cook_Rd_3.JPG\nAnd here's a few pics of the actual building were I \nused to work on telephone switches.\nhttp://www.thecentraloffice.com/Calif/IE/AT&T%20San%20Bernardino/AT&TSanbern.htm \nlove that place that was allot of fun, getting to know\n what makes a phone call work and how to build that stuff.
761790
Your transmitter will work, your receiver won't.\nbut you could bounce the signal onto a simple solar cell\nconnected to a set of headphones and you should be\nable to receive a weak signal...\nYour receiver won't work because light won't move the paper and the grains of sand.....
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/
275478
Cell phones, TV and radio reception
251907
No way, unless your Cell Phone uses the same frequency range. I have a wireless internet router and it caused a sound in our wireless phone, I disabled wireless and left the wired connection.
692657
wireless application protocols (WAP), 3g, gprs etc... mostly using gigahertz frequencies under environmental health spectrum, around 3.5GHz.... these spectrum also covers radio waves and microwaves, some transmitted via satelites.
930133
I'm afraid the question is a little loaded and misleading. All things "cause" radiation, since all matter "causes" some form of radiation, even if it's only the odd photon of light. \n\nI think the question you are trying ask concerns studies of the effects of cell phone radiation. All those I have seen are inconclusive. However, over many years I have found New Scientist to be an invaluable source of good information and rational argument - try their web site.
557779
you can take a cellular phone, it's work very well ;)
163921
I believe bluetooth uses 2.4 GHz, but I could be wrong about that.\n\nBasically the modern wireless standards and cellphones use frequencies which are not ionizing. Higher frequencies, with more energy, can zap the electrons off atoms and that can cause medical problems. Non-ionizing radiation just sort of wiggles the atoms around. (These are technical terms of course...)\n\nWhat confuses people sometimes is that the 2.4 GHz is also the frequency for a microwave oven. But a microwave has a very powerful radio source inside so it wiggles the atoms in your pot roast, or whatever, a lot, in order to heat them.\n\nBluetooth being so short range is even weaker, I believe, than a typical cellphone. \n\nYou're not going to heat you brain with a cell phone. So the chance of any danger is extremely slight. (Of course that danger also depends on how much you use the phone.)
910185
It's the problem with the handset.
827649
it works in areas where service is poor and a phone conversation is not possible because of reception
232251
YOU SURE DON'T WANT MUCH DO YOU!\n\nFIRST ANALOG DATA IS THE TALK DATA, THERE IS A CARBON MICROPHONE IN THE PHONE HANDSET WHEN YOU TALK IT CHANGES RESISTANCE AS THE SOUND WAVES HIT IT.  NOW THERE IS A DIRECT CURRENT 20 MILIAMP FLOWING THRU THIS IT ALSO FLOWS THRU A NETWORK WHICH IS IN THE BASE OF THE PHONE.  YOUR EARPHONE IS MAGNETIC AND IT CONVERTS THE CHANGING IN THE CURRENT BACK INTO SOUND. ANYWAY THE TALK PART OF PHONE, THE ORIGINAL THING PHONES DID IS CARRIED OUT BY DIRECT CURRENT, (BATTERY POWER). THE PHONE RINGS WITH A ALTERNATING VOLTAGE OF 90 VOLTS AT 20 CYCLES PER SECOND.  THE BELL IS CONNECTED TO THE LINE THRU  AN CAPACITOR WHICH PASSED THE AC BUT DOES NOT PASS THE TALKING DC VOLTAGE. THUS THE BELL DOES NOT MESS UP YOUR TALK!\n\nDIGITAL DATA IS SUPERIMPOSED ON TOP OF THE DIRECT CURRENT AND IT IS A VERY HIGH FREQUENCY! SO THAT IT CAN BE SEPARATED FROM YOUR VOICE FREQUENCY, THUS THERE IS A FILTER WHICH IS INSTALLED AHEAD OF THE PHONE WHICH SEPARATES THE HIGH FREQUENCY DIGITAL FROM THE LOWER FREQUENCY VOICE.  THIS HIGH FREQUENCY DIGITAL SIGNAL IS FED INTO THE MODEM AND CONVERTED TO PURE DIGITAL SIGNAL FOR THE COMPUTER.\n\nSO WE HAVE 2 LITTLE WIRES CARRING MANY SIGNALS\n\n1. RINGING SIGNAL AC 20 CYCLES 90 VOLTS\n2. TALK SIGNAL DC VOICE FREQUENCY 3-6 VOLTS\n3. DIGITAL SIGNAL AC HIGH FREQUENCY \n\nTHATS IT.\n\nHOPE I HELPED YOU!\n\n\nAPS
1063010
The bluetooth works on 2.4 GHz frequency that send and recieve through it .
102553
http://electronics.howstuffworks.com/cell-phone.htm
30942
If it'smade from iron materials the electromagnetic wave will be absorbed by the iron and the signale in teh phone will be so bad
1031745
The difference in frequency has all to do with the coverage of a cell. 1800s cover less area (More the frequency, more attenuation, less area) 900s cover more.\n\nThe base station that transmits the voice to cellphones do that on a TDMA and FDMA basis. \n\nIf you need to do the shift of frequencies, you will have to look for the neighbouring cells and their frequencies.
1137260
usually it doesnt- it depends on your phone service.