The $1,999 iPhone Duo goes on pre-order Friday, Oct. 16, and heat is the open question. Apple's engineers told PCMag a graphite pipe through the hinge spreads heat across both halves, while one early hands-on report, per Android Headlines, says it ran very hot shooting 4K. PCMag has not yet tested the Duo.
What Apple's engineers told PCMag
PCMag spoke with Dan Murray, Apple's vice president of silicon engineering, and Banafsheh Barabadi, senior manager of thermal product design. As PCMag reports:
- The Duo's vapor chamber is thinner than the one in the iPhone 18 Pro, and it "floats in the middle" rather than serving as a central support piece.
- Apple routed a flexible graphite pipe through the hinge to move heat between the two halves, adding surface area to shed it.
- Barabadi called it "one of the most technically challenging aspects of our design," and said the part has to survive "many hinge cycles while maintaining its thermal connectivity, and also its structural integrity."
What one creator reported
Android Headlines says MediaStorm's Tim found the Duo's thermals fine for day-to-day tasks, but the area below the camera got very hot when he recorded 4K video. IT Home says that was about three minutes of 4K 60fps on a demo unit at Apple's launch event, and that he called it one of the hottest phones he has tested.
Android Headlines adds that demo-unit software may not be final.
Where the two claims meet
PCMag says it expects to test the A20 Pro in the Duo in the coming weeks. Android Headlines frames the same question: unfinished software, or a vapor chamber that is not working as well as it should. Neither outlet has an answer yet.
Apple's announcement describes the opened Duo's 7.6-inch inner display as a canvas for viewing content, gaming and multitasking.
Apple's announcement claims up to 35 percent better sustained performance than iPhone 17 Pro, and lists:
- Pre-orders: begin at 5 a.m. PT on Friday, Oct. 16, in more than 70 countries and regions Apple names, including the U.S., Canada, the UK, Australia and India.
- Availability: begins Friday, Oct. 23 in those markets.
- Price: starts at $1,999 in the U.S.
Our earlier stories cover the price and pre-order details and the hello setup.
Why it matters
Our read, untested: this is a plausible design answer to a real problem, since a folded phone is twice as thick and has less surface to shed heat. But a claim about a part is not a measurement of the phone, and the launch-event heat complaint above does not establish sustained recording performance on retail units.
If you mostly use a phone for everyday tasks, which is where Android Headlines says the creator found thermals fine, you can pre-order without waiting.
If you record long 4K clips or play games for long stretches, a tested review is the better basis; PCMag says it expects to test the Duo in the coming weeks. For a heavy video shooter who does not want to wait, the iPhone 18 Pro is the alternative, and PCMag says its vapor chamber is the thicker one.
