PLEASE NOTE THIS WARNING AND BE CAREFUL
If you receive a phone call on your mobile from any person, saying that, he or she is a company engineer, or saying 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.  
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 datas 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.          

PLEASE FORWARD THIS PIECE OF INFORMATION TO ALL YOUR FRIENDS HAVING A MOBILE PHONE