I predict that someday soon, supermarkets will sell my food purchase history to insurance companies, so when I buy loads of vegetables and such, I use my real number. When I buy wine & bacon -- you guessed it: 867-5309.
Tip #2: They also link purchase records based on debit card account numbers. So pay cash.
Tip #3: if the number doesn't work for your area code, try it with a different area code. (the sysadmins sometime purge a number that is being used by loads of people.) Also, if you need to provide a zip code, Beverly Hills 90210 works just fine.
That won't help, your purchases can still be linked to yourself with your credit card.
This doesn't seem to add much value on top of
>> Tip #2: They also link purchase records based on debit card account numbers. So pay cash.
Do you actually do this? It hasn't worked for me most places I've tried it. In a couple cases it froze/crashed their system. I always wondered what people who legitimately have this number do.