iPhone Duo, Apple’s first foldable iPhone, went up for pre-order today. Within minutes of pre-orders opening, however, estimated delivery dates started slipping all the way to next year.

The first iPhone Duo pre-orders are set to arrive on October 23, but only for the lucky people who placed their order in time.

As of 8:30 a.m. ET, all iPhone Duo configurations are backordered until next year. All color and storage combinations show an estimated ship date of January 25. Some users are even seeing January 29 for their estimated shipping date.

This is a combination of strong demand and severely constrained supply for iPhone Duo. It’s impossible to know the exact balance between the two, though.

Going into the launch, there were multiple reports suggesting iPhone Duo would be in short supply as Apple was still ramping up production.…