Nearly two decades after Steve Jobs mocked the stylus on the original iPhone stage, Apple has put an Apple Pencil on an iPhone.
Apple’s new foldable, the iPhone Duo announced on September 9, will support the Apple Pencil with USB-C. The line is easy to miss in Apple’s press release, but it’s official: “Later this year, iPhone Duo will support Apple Pencil with USB-C, allowing users to take notes, sketch, or mark up documents on either display.”
Which Apple Pencil works with iPhone Duo?
Only one: the Apple Pencil with USB-C, the $79 model Apple sells alongside the Pencil Pro. If you own an Apple Pencil 2 or an Apple Pencil Pro, it won’t work with the Duo.
The likely reason is charging. On an iPad, the Pencil 2 and Pencil Pro snap onto a magnetic strip that pairs and charges them. Reports indicate Apple couldn’t fit that charging mount into the Duo’s hinge mechanism without interfering with the fold, so the phone relies on the USB-C Pencil, which pairs and charges over a cable instead.
The upside: the Pencil works on both of the Duo’s screens – the 7.6-inch inner display when it’s unfolded and the 5.4-inch outer screen when it’s closed. That means quick notes without opening the phone, and a properly big canvas when you do.
When does support actually arrive?
Not at launch. iPhone Duo pre-orders start October 16, with the phone shipping from October 23 (from $1,999), but Pencil support needs a software update later this year. The Duo ships with iOS 27.1 in October, and pegs the Pencil update as likely landing with iOS 27.2 around November. Apple hasn’t given a date beyond “later this year.”
What the USB-C Pencil can and can’t do
Per Apple’s own spec page, the Apple Pencil with USB-C offers pixel-perfect precision, low latency, tilt sensitivity, and support for Apple Pencil hover on compatible devices. What it lacks compared to the Pencil Pro:
- No pressure sensitivity
- No double-tap gesture
- No squeeze gesture or haptic feedback
- No Find My support
For handwriting, markup, and casual sketching, that trade-off is easy to live with. For serious illustration, pressure sensitivity is the real loss.
One intriguing detail: developer pdfu dug through iOS 27’s release candidate code and found a Duo-specific branch tied to Apple Pencil hover (via ithinkdiff). Code isn’t confirmation, but Apple rarely builds hardware-specific paths for features the hardware can’t run – and hover on a $79 stylus with no pressure sensor would be a genuinely useful addition.
The Pencil that never shipped
According to Bloomberg’s Mark Gurman (via MacRumors), Apple originally developed a shorter Apple Pencil sized to carry with the iPhone Duo, but scrapped it over “technical problems ahead of mass production.” Supporting the existing USB-C model was the fallback. A pocketable Pencil would have made the Duo a true Galaxy Note rival; as it stands, you’ll be carrying a full-length Pencil with no way to attach it to the phone.
Why this matters
Apple has spent years insisting touch is the only input a phone needs. Putting Pencil support on the Duo – even through a software update, even with the entry-level stylus – is an admission that a 7.6-inch folding screen invites pen input. If you already own a USB-C Apple Pencil for an iPad, it’s about to become a two-device accessory.
