Samsung Galaxy S 5 - Mute the Ringing Sound; Reject an Incoming Call

Phone App 87
2. To end the call, tap .
 The call ends.
Mute the Ringing Sound
To mute the ringer without rejecting the call, press the volume button down.
Reject an Incoming Call
■ When a call arrives, drag to the left to reject it.
 The ringtone or vibration will stop and call will be sent directly to voicemail.