Piranhas!! I've been getting these calls since I purchased my new prepaid phone a couple of months ago. This particular number belongs to Express Marks Sweepstakes. When you call they provide you with an opportunity to "cancel" your "subscription" to the sweepstakes service. Hmmm, never signed up from what I remember. Anyway, the cancellation from the service will take up to 7 days. We'll see.