Let's say that…?

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If celphones transmit data on wireles signal from 800mhz to 900mhz is it posible to intercept conversation on a device (moded radio) if seted on exact frequency? or phones transmit encoded signal like wpa? i'm curious. On a site it said it has to do with mw amplifier, for example on wifi i got a 1000mw adapter

If celphones transmit data on wireles signal from 800mhz to 900mhz is it posible to intercept conversation on a device (moded radio) if seted on exact frequency? or phones transmit encoded signal like wpa? i'm curious. On a site it said it has to do with mw amplifier, for example on wifi i got a 1000mw adapter on 2,4ghz (this is 30dbm i think) and on a site it said what exceds 1000mw goes into class 1 mobiles. So mw or frequency has to do with that? i don't want to spy or something ,i'm just curious.
Rephrase: is it posible to intercept conversation on a device (moded radio) if seted on exact frequencyand by using a cantena or parabolic trinagulation device? saw that in a movie

Other answer:

Master:
Yes you can intercept a cellular signal, you would need to "pirate" the SIM number if you wanted to understand anything being said! Digital radio isn't directly copied into analog scanners and digital scanners have to have the "decode" that is used in order to understand what is transmitted.
On number 2 of your additions.. yes you can indeed intercept signals sent to satellites as well! Radio does NOT just travel "straight up" as you think. You can even intercept satellite from the satellite if needed. Again, not easy but it is possible and some government agencies can and do monitor some signals. Bring enough money and you too can be a spy… however you too can go to jail. Never believe everything you see on TV most of it is fake and made up.
Frank:
Everything is digital and spread spectrum. It can be encrypted…but if you only get part of the digital signal…you won't get the whole message on just one frequency.

Cellphones USE to be analog…and people had special devices that could let them HIJACK the signals so that they could sell cloned phones….that doesn't happen anymore.

Andrew:
IDK, but I do know that if this is possible that you would still have to go through the encryption of the messages, btw if you are trying to read some else's messages without their permission (and knowledge) it is an illegal crime that can send you prision. So watch yourself and what you say online and what actions you take.
Waltz49:
A basic scanner used to be enough to listen to cell phones (and baby monitors, car phones, etc). Now most of that stuff is digital and some, if not all, is encrypted.

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