phone tap

[scoobyneil]

hi all

Is there a way to grab a mobile phone number when you no one number but not the other one when some one is makin a call and can you listen in on a mobile call from a short range as i am getting shit from a girlfriends ex boyfriend

neil

[admag]

Don't know! but if you keep a diary of the calls and the content, the police can get the details from the network. But there has to be sufficient cause to do so. Threats of the physical nature to you/her your property etc.

I'd simply change your number, cheap enough these days plus you can give it out just to those who need it! or don't answer any numbers you don't know or those withheld. ytour voicemail will pick them up, if he leaves a message then you have proof of the harrassment! hope this helps

[LB]

No GSM is encrypted between the phone and the base station. I know someone who works in that type of industry who says it not encrypted from the base station onwards so with the right type of aerial you can listen in at the base station but he could just be winding me up - but its def encrypted to the base station - with a derivitive of DES encryption iirc.

[Deep]

No GSM is encrypted between the phone and the base station. I know someone who works in that type of industry who says it not encrypted from the base station onwards so with the right type of aerial you can listen in at the base station but he could just be winding me up - but its def encrypted to the base station - with a derivitive of DES encryption iirc.

I thought it was hard-wired or PSTN from the base station, not RF transported?

[Burratha]

The signal is encrypted between mobile station and base station. (handset and phone mast)

The carriers then use traditional methods (ie. BT lines, for example) to transmit the conversation.

[C4RtM4N]

My understanding is that cellular base stations are wired into the DSTN network via ISDN lines.

I have been talking to people in security circles and it is possible to intercept GSM phone calls, however the equipment required is not generally available to the masses.

I think in the situation that you have at the moment, your best course of action here would be to record the calls on your phone (if it has the facility to do this) or make records of each call. Police can do a billings enquiry on your phone to establish incoming and outgoing calls for your phone.

Depending on the area that you are in, your local force may be inundated with telephones for much more serious offences, so I can't see them taking any action as a priority. If you are on a Pay as You Go phone it may be easier to get a new SIM Card, or if you are on a contract I would see about getting your number changed due to unsolicited calls. There may be a small charge for this, however im sure the peace of mind will be worth it.

[Jollygood]

The reality of any situaion like yours is proof. Each network operator runs a centre called the malicious call bureau that handles such complaints. You will need to report the nuisance/malicious calls to the operator at first instance. There are two statutes that contains provisions for complainants:

1. The Telecommunications Act (nuisance and malicous calls).

2. The Harassment Act

The operator can then log calls made to your phone but require you to identifying which calls you believe to be nuisance/malicious by a special code that they ask you to enter after each relevant call. The findings can then be handed to the police, along with your own log that you have kept (as suggested to you above).

The issue about unalwful inteception of your calls is a serious matter. The GSM mobile radio network operators in the UK encipher calls. The chances of listening to each and every call you make (given enciphers keys change) would be to suggest an event occurring in the nework not external (radio) to it. The GSM network uses both fixed landline and microwave to carry call data.

[Ghost_Rider]

No GSM is encrypted between the phone and the base station. I know someone who works in that type of industry who says it not encrypted from the base station onwards so with the right type of aerial you can listen in at the base station but he could just be winding me up - but its def encrypted to the base station - with a derivitive of DES encryption iirc.

As stated above, the Air interface in GSM is "protected" by low grade ciphers. This was introduced during the transition from the first-generation of Analogue mobiles to the more common 2G digital phones, as te first-generation calls could be intercepted by anyone with an RF scanner (similar to that used by "plane spotters" for listening to a/c and tower transmissions). The 2G network uses A5/1 'encryption' techniques, which are generally accepted to be fairly weak in cryptographic terms (cryptome comments (http://cryptome.org/gsm-joke.htm)), with anecdotal reports of a low-end pc successfully decoding a transmission within 15ms...:pigsfly:

Of course, depending on how paranoid you are, someone could also be sat down the road from you with their own base station imitating the network :D

If you are REALLY paranoid, why not invest in one of these devices and utilise end-to-end encryption, which is becoming more popular in commercial circles to prevent sensitive contractual information escaping..

(From http://www.cryptophone.com/)


http://www.idgeurope.com/products/secure_communication/CryptoPhone220.jpghttp://www.idgeurope.com/products/secure_communication/gsmk_cryptophone_G10i.jpg


Ghostie

[stuart30]

I may have remeberd this incorrectly but im sure the old Nokia 3310 could be used for something similar posters question.

Might be worth a quick google....:)

[Mickey]

I may have remeberd this incorrectly but im sure the old Nokia 3310 could be used for something similar posters question.

Might be worth a quick google....:)


Its called a spyphone and are freely available on E bay, however if i get the jist of this thread correctly then this would not solve his problem.