Step 1: Identify your iPhone
To confirm eligibility, simply enter your phone number and iPhone serial number in the fields provided.
Step 2: Enter your access code
You will receive an SMS text message on your iPhone containing the access code to redeem your $100 credit. Enter your phone number and your access code in the fields provided to generate an electronic store credit.
Step 3: Get your $100 Apple Store credit
You will receive a $100 electronic store credit to purchase products at the Apple Retail Store or the Apple Online Store.
The lame part is the credit cannot be used on iTunes.