It seems there might be a slight mix-up in the information provided.
**Apple currently does not produce a foldable iPhone.**
The device you might be referring to, which features dual screens (rather than a single foldable one) and has faced supply constraints despite strong sales, is likely the **Microsoft Surface Duo.** Microsoft has indeed reported challenges in meeting demand for the Surface Duo, especially ahead of the Christmas holiday season, due to supply chain “constraints.”
This situation specifically applies to **Microsoft’s Surface Duo**, not an Apple product.
