Each cell phone can be traced, regardless of the SIM card used: Check: IMEI number (International Mobile Equipment Identity) in Google
This technique was used to solve a murder case, last year, in Belgium. The murderers activated the stolen cell phone with another CIM card. Normally EMEI is used to block stolen cell phones but in this case it sent a mobile operator in high alert. Bart >>> [EMAIL PROTECTED] 25/10/2005 23:05:00 >>> Also if you are using a cel-phone for nefarious reasons it is kind of simple to have a bunch of SIM cards to keep changing your phone number which makes it even more difficult for the authorities to monitor your calls.

