Try this Calculation !!!!

1) key-in the first 3 digits of your handphone number (exclude the first number '9') into the calculator
2) multiply by 80
3) add 1
4) multiply by 250
5) plus last four digits of phone number
6) plus last four digits of phone number again
7) minus 250
8) divide by 2 at last

Is it your handphone number ????