Of handphone numbers and calculations

Got this in my mail....
Give it a try...

Is this your h/p number?
1)key-in the first 3 digits of your handphone number (not the 01x> number) into the calculator
2) multiply by 80
3) add 1
4) multiply by 250
5) plus last four digit of phone number
6) plus last four digit of phone number again
7) minus 250
8) divide by 2 at last
Is this your handphone number????
AMAZING ISN'T IT !!!