Silence iPhone Ringer by Hitting Volume Buttons
If you’re getting an incoming call and you want to quickly silence the iPhone, just hit either of the volume buttons to instantly silence the ringer. This will immediately mute the iPhone and stop the ringer from sounding any alert or vibration, but it does not send the call to voicemail so the caller won’t have any idea that you aren’t listening to the phone ring.
Because it’s so easy to tap one of the side volume buttons and they are easy to tell apart from touch alone, this is a great strategy to mute calls while a phone is in your pocket. I use this all the time for one-off occurrences like while you’re waiting in line at a public place, in the middle of a conversation, or if you’re in a meeting, or any other places where letting the phone ring aloud is considered distracting or rude.
Remember that this only effects the ring for that particular incoming phone call, and if the caller dials you immediately again it’ll sound again until you hit the volume button, and obviously all other calls will still sound the ringer as well. If you’re getting tons of calls and want to silence the ringer for them all, just hit the mute switch on the side of the iPhone, which shushes them all until it’s turned off again.
Speaking of Mute, if the iPhone is on muted mode, the ringer obviously won’t sound… but the phone will vibrate instead. In the cases where mute is active, hitting one of the volume buttons will cause the vibration to stop, completely silencing the phone.