ive just got e-mail from a freind
dont know if theres any truth in it ,thought id post it so you can make up your own mind,but better to be safe than sorry

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 that they're checking
your mobile line, and 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 friends as you can, to stop it.
All mobile users pay attention if you receive a phone call and your
mobile
phone displays (XALAN) on the screen don't answer the call, END THE CALL
iMMEDIATELY, if you answer the call, your phone will be infected by a virus. This virus will erase all IMEI and IMSI information from both your
phone and your SIM card, which will make your phone unable to connect
with
the telephone network. You will have to buy a new phone. This information
has been confirmed by both Motorola and Nokia. There are over 3 Million
mobile phones being infected by this virus in all around the world now.
You
can also check this news in the CNN web site.
PLEASE FORWARD THIS PIECE OF INFORMATION TO ALL YOUR FRIENDS HAVING A
MOBILE