When "Riding Mode" is turned on, everything except incoming calls will
be muted by default.
Go to [Settings] > [Smart Services] > [Smart Driving] > [Riding Mode] >
[Do Not Disturb].
Allowed Calls
You can customize to whom you allow their calls, including the calls
"From Anyone" "From Contacts Only" "From Favorite Contacts Only" or
"Decline All Incoming Calls".
Ring for Repeated Calls
Turn on the "Ring for Repeated Calls" function to allow the repeating
calls from the same number calls within 3 minutes.
Auto SMS Reply After Rejecting a Call
When "Auto SMS Reply After Rejecting a Call" is turned on, the system
will automatically respond to the caller with an SMS after rejecting the
call. You can also customize content in the replying texts.