On-body detection works by using accelerometers built into the phones.
Google has not confirmed the feature yet but the blog Android Police and several regular users have reported it showing up on their devices.
Android users already have the ability to “face unlock” their phones, a security feature similar to Apple’s TouchID, which lets users program their phones to unlock by using facial recognition software.
Not a fan of allowing technology to recognize your unique facial features or biometric, that’s fine, you can still opt to use the traditional password to unlock your phone, but if you’re an Android user who thinks all this sounds pretty cool but you’re having problems enabling it on your device, just be patient.
As Android police reported, the new feature appears to be one Google is rolling out slowly, but surely.