The motion chips in the non M9 phones get turned off while they're locked. That's probably why it's only on the newest devices. The SE must have it because they didn't bother to disable it since it has the hardware already. They might add it to older devices but it seems like it needs the newest chips.
Did you know? iPhone 5S/6/6Plus has a always on(when the phone is on sleep) embedded motion processor (m7 and m8) ? It can track ur steps, distance and floors(m8) even when the phone is on sleep.
M9 chip has a only difference and its always on microphone. In this feature we dont need microphone.
Explain us, this motion coprocessor's how could measure -even phone's get turned off while they're locked -our steps, floors and distance ?
I'll tell you.
Step counter in the health application uses the gyroscope, accelerometer, gps and other sensors to detect if you are walking.
What does this mean?
This means m7 and m8 motion coprocessors works phones get turned off while they're locked.
We need always-on Gyroscope or Accelerometer for this and we already have both of them.
Look, its 99% motion coprocessor driven since it uses movement to activate. Just like it needs the coprocessor for the steps in the health app. You cannot run the gyro etc constantly even when the display is off; bye bye battery life. Logical conclusion without the facts is it is the coprocessor.
Also on the Apple motion coprossor wikipedia "In
iOS 10, the motion coprocessor is used for raise to wake functionality."
So it is a hardware limitation, and may be one in the older M7 and M8 too as I believe they are off when the screen is locked (hence no Hello Siri), not some conspiracy theory trying to withhold it from older devices.
Yes, we can run the gyro etc constantly even when the display off.
Remember that Apple developed that motion coprocessor for improve battery life and this coprocessor always works even when the display off. If this coprocessor does not work on display off then it couldn't count our steps. But it can count.
And on the power save mode iPhone's step counter doesnt work. Because we are disabling that sensors for better battery life.
If we are still worried about battery then we can turn it off. Like battery saver mode. But its not about battery.
I believe Apple must get this feature to m7 and m8 devices.
If Apple cant get this feature, I could lose my loyalty.
Me and this m7 and m8 device owners can say that;
Its about planned obsolescence.