Hp Number- Amazing

Interesting one.. somebody really have the time to figure this one out... 1) key-in the first 3 digit 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 it your handphone number????