Apple’s 2017 iPad does not support untethered Hey Siri

Apple's fifth-generation iPad, which launched in March 2017, does not support tetherless “Hey Siri” functionality even though the device features an embedded M9 motion coprocessor. As first noted by AppleInsider, the 9.7-inch iPad Pro is the only Apple tablet the feature is currently available on.

An always-on Siri requires that the device be outfitted with a low-power motion coprocessor embedded into the main chip. This lets iOS listen for the “Hey Siri” wake up phrase on battery power, in the background, without waking up the main power-hungry processor.

TUTORIAL: “Hey Siri” not working? Here's your troubleshooter!

“Hey Siri” made its debut with iPhone 6s, the first Apple device to embed the motion coprocessor in the main processing chip. All iPhones from iPhone 6s onward support “Hey Siri” on battery power, including iPhone SE and the latest iPhone 7 series.

The 12.9-inch iPad Pro is another Apple tablet without support for tetherless “Hey Siri” despite the inclusion of the M9 chip. It's unclear at the moment if Apple could eventually enable untethered “Hey Siri” in software on the new iPad and the 12.9-inch iPad Pro.

iPhone 5se said to run A9/M9 chips, come in 16/64GB capacities

Apple's allegedly upcoming four-inch iPhone refresh, that some people believe will be marketed as 'iPhone 5se', is said to include “variants” of the A9 system-on-a-chip and the M9 motion coprocessor, both of which are found inside the iPhone 6s, rather than the previous-generation A8 and M8 chips, according to 9to5Mac.

iPad Pro doesn’t support untethered ‘Hey Siri’

Although Apple's iPad Pro Tech Specs webpage states in black and white that the device's A9X system-on-a-chip includes an embedded 'M9' motion coprocessor, just like its A9 counterpart powering the iPhone 6s and iPhone 6s Plus, the tablet doesn't support untethered 'Hey Siri' functionality when not connected to power, AppleInsider discovered yesterday.

Why iOS 9’s Facedown detection doesn’t work on iPhone 4s, iPhone 5, iPad and iPod touch

Facedown detection stands as one of the underrated features in iOS 9's rich arsenal of power-saving tactics designed to help extend your run time by up to an additional hour.

Facedown detection avoids turning the display on when a notification comes in and your phone is put facedown. But as it turns out, Facedown detection doesn't work on all devices compatible with iOS 9 and there is a good explanation for that  why.