This is just a new and perverted spin on an old tactic. Forms, sweepstakes entries and coupon offers have always been about harvesting you for marketing purposes. 'Tis sad that we have to hoard our mailling addresses and phone numbers to prevent them from falling into the wrong hands!

In general, if I must fill out a form, I leave the phone number blank or insert garbage. ("999-999-9999") After all, they are going to MAIL you a coupon, right?