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Samsung [samsung.com] offers $50 Samsung Credit, and up to an additional $1,500 in savings (via trade-in) when you pre-order the newest phone from Galaxy, with Your Reservation to Pre-Order Next Samsung Galaxy Device when you fill out the form provided on the promotional page.
Plus, enter the sweepstakes for a chance to win $5,000 Samsung Credit.

Note, must fill out the form completely to qualify; by providing your email, you acknowledge Samsung will contact you about your reservation.