2 friends, 2 different centres

have you all ever received such an email before?

our handphone number
1) key-in the first 4 digits of your handphone number 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) Finally, divide by 2 Is this your handphone number????

hahaha! quite fun huh! i was so amazed that i test it with different hp numbers and it still works.