I have used it many times. You have 2 options:
1) make a genius bar appointment and take your phone in; or
2) call 1-800-My-iPhone and have them mail you a replacement - they will charge your credit card for the non-return fee and when you mail your broken/defective device back, they refund it. If your device has accidental damage, they charge you the $99 deductible + sales tax.
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Is your device damaged or defective?