Dont know if anyone is aware of this but just got email at work about it...for your info -
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'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.