Today is arguably one of the most important days for Apple in decades. It’s when the company’s first foldable phone, the iPhone Duo , goes on sale.

But so far Apple’s biggest problem with the device doesn’t seem to be convincing people to buy it. Rather, the company doesn’t have the supply to meet all the demand.

That means Apple fans who want an iPhone Duo on Day 1 may struggle to obtain one. But if you live in certain markets, all is not lost. There’s still a chance you can get your hands on an iPhone Duo today. Here’s what you need to know.

Where Apple will have walk-in iPhone Duos for purchase

When pre-orders of the iPhone Duo began on October 16, shipping time quickly slipped from days to weeks to months.…