Itching to “trade up” from your iPhone to a shiny new BlackBerry Passport? Thanks to BlackBerry’s latest promotion, you’ll be able to do just that. The program will let Passport buyers get up to $550 in credit towards the new device when they trade in an iPhone 4s or higher.

In order to get the full amount, you’ll need to trade a brand-new iPhone 6 (or presumably a 6 Plus, though it’s not specifically listed on the chart). The trade-in value for each device is actually much lower (ranging from $90 to $400), but shoppers buying a Passport will get a “top-up” worth an additional $150.

If, for whatever reason, you’d like to take advantage of this offer, you’ll need to wait just a few weeks. The program goes into effect on December 1st and runs through February 13th.

The Passport sports a square 1440×1440 resolution display and a “touch-enabled” physical keyboard. It went on sale earlier this month.