Why Apple Put a Thread Radio In the iPhone 15 Pro

On Tuesday, Apple unveiled the iPhone 15 Pro and Pro Max featuring USB-C ports, titanium bodies, and Action Buttons. They're also the first smartphones to support the open-source smart home protocol Thread. The Verge's Jennifer Pattison Tuohy explains how Apple might deploy this wireless connectivity protocol in its ecosystem: The obvious use for Thread in the iPhone is as a Thread border router for the slew of new Apple Home and Matter-enabled Thread smart home devices from companies like Eve, Nanoleaf, and Belkin WeMo. This would mean you wouldn't have to have a HomePod Mini, Apple TV 4K, or other Thread border router to use Thread smart home gadgets with your iPhone.... [Jonathan Hui, VP of technology at the Thread Group and a software engineer at Google] says that Thread connectivity in a smartphone will allow it to communicate directly with a Thread device. 'Compared to existing smartphones without Thread, a smartphone with Thread can communicate directly with a Thread device, without relying on a separate Thread border router or any other communication technology,' he said.

Another possibility with direct control is some type of trigger or presence detection. Your Thread devices could know you're home as soon as you walk into the house and respond appropriately. However, presence detection -- something the smart home sorely needs -- would be easier to do with the UWB chips already in most iPhones and HomePods (and is already being done to some extent). As an IP-based mesh protocol, Thread could be a more reliable way to connect multiple such devices to your phone while also having multiple 'parent' devices within the same home (such as your iPad, MacBook, or other family member's iPhones). Its IP characteristic makes it easier to maintain a persistent data connection directly to the device, says Moneta. Additionally, Thread being mesh means your device doesn't have to be in range of the controller (iPhone/iPad etc.), as it would with Bluetooth. This could apply to Apple accessories such as the Apple Watch and third-party devices that use Bluetooth, like camera accessories and medical devices. Of course, all of those would need a Thread radio in, too, so that's not going to happen anytime soon.

A popular theory in my X (formerly Twitter) feed after the Apple event was that Thread is in the iPhone 15 Pro line more or less as a freebie. It's plausible that the Wi-Fi / Bluetooth chip Apple is using in its highest-end phones comes as a sort of three-for-one: you pay for Wi-Fi and Bluetooth, and you get your Thread for free! Given that Apple itself doesn't seem to have a clear idea or any concrete examples of what the Thread capabilities will add (beyond a vague 'opening up future opportunities for Home app integrations' statement in the iPhone 15 press release), this does seem to be the most likely reason -- for now. Although, Apple rarely does anything without some purpose in mind.

Read more of this story at Slashdot.