Hello,
>
>My local pizzeria has a little problem:
>
>"People call in to order pizza's, but they never collect their pizza's".
>
>The guy is trying to figure who these people are that never collect their
>pizza's.
>
>These people are using:
>
>Mobile cell phones.
>And even Skype systems ?!
>
>The pizza guy tries to do it as follows:
>
>"Write down customer numbers, and sometimes call them back"
1) Get a caller-id box and don't take calls from anonymous callers.
2) There are reverse look-up databases around which can be used to get an address which belonges to a phone number. If the address doesn't match the number, skip the customer.
3) Keep a database with people that ordered before and see if their addresses match.