Dont know if this is correct or not but decided to post anyway.

just recieved this email:
Dear All


If you receive a phone call on your mobile from any person, saying that he or she is a company engineer, or telling you that they are checking your mobile line and that you have to press #90 or #09 or any other number, end this call immediately without pressing any numbers.



There is a fraud company using a device that once you press #90 or #09 they can access your "SIM" card and make calls at your expense. Forward this message to as many colleagues, relatives and friends as you can, to stop it.



Many thanks for your time regarding this matter, take care and regards.



Phil Corris



Police Constable/Crime Prevention Officer Ext 496696 (Internal) 01524 596696 (External) Email PhilCorris@lancashire.pnn.police.uk



Graeme Cairns PS3521

CIMU Sergeant Oxford

Tel. 721 6319

It's a hoax (sorry).
It doesn't do anything on mobile or landlines, only on some PBX's

http://www.snopes.com/fraud/telephone/jailcall.asp
http://www.trendmicro.com/vinfo/hoaxes/hoaxDetails.asp?HName=%2390%2F09+Cell+Phone+Warning+Hoax&Page=1


[Edited on 10/9/07 by iank]