Found this online.
** This applies only to those customers who did not receive a free bumper or case in the 2010 promotion.**
Did you have to deal with issues brought about the Antennagate scandal plaguing the first batch of iPhone 4 devices? If you were, or indeed still are an owner of an original iPhone 4, you can request a $15 settlement from Apple.
To make your claim and get your pound of flesh from the super-rich Cupertino company, follow this link and fill in your details.