Auto Call When Near the Ear:

This function available in your contact details, call details and message conversations interface, as long as you turn this feature on, you only need to pick up the phone near the ear in these interfaces, the system will help you to make the call.  

Auto Answer When Near the Ear:

When you turn this feature on, in the incoming call interface, you only need to pick up the phone and near to the ear to automatically answer the call. 

Mode Switching During Calls:

When you turn this feature on, during the call, pick up the phone and near to the ear, the Speaker will automatically switch to the handset, providing you with more convenient and private calls.

Flip to Mute Incoming Calls:

When you turn this feature on, if you are not able to answer the call, for example, if you are in a very important meeting, you only need to flip the phone to mute.

Path: Settings-->Convenience Aid-->Gesture & Motion-->Smart Call.