Note this will only work with 7 digit phone numbers and you must press equals after each step.

1. Type the first 3 numbers of your phone number in a calculator
2. Times that by 80
3. Add 1
4. Times by 250
5. Plus the last 4 digits of your number
6. Plus the last 4 digits of your number again
7. Subtract 250
8. Divide by 2
does the number look familiar?

