There’re several ways to silence the ringer before answering a call.
Method 1: Press the Volume Down/Up or Power button on the side of your device.
Method 2：Go to menu -> “Settings” -> “Button & gestures”-> “Gestures”-> “Flip to mute”-> activate “Mute incoming call”. You can then mute incoming calls by turning the phone over when a call is being received
Method 3: Go to menu -> “Settings” -> “Sound & vibration”-> activate “Silent mode”.
Method 4: Drag the Status Bar down with your finger and then touch the “Sound” icon to change to “Vibrate” or “Mute”.
Method 5: Go to “phone” app ->touch top right corner then enter “Settings” -> “Flip to silence”-> activate “Flip to silence”. You can then mute incoming calls by turning the phone over when a call is being received
Note: Press the “power” key and “volume up” key at the same time to switch to vibration mode quickly.