Will iphone alarm work if phone is off

• Your alarm will sound when your iPhone is on vibrate mode, regardless of whether the ringer is turned on or off.
• You should still make sure that your alarm is set to a ringtone (anything other than "None") and that your iPhone's volume is loud enough that you will be able to hear it. 
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We all lead busy lives, and having your phone dinging, beeping, and ringing every time you receive a call, text, or email isn't necessarily convenient. 

For this reason — or simply for sheer personal preference — many people choose to silence their iPhone's volume in favor of turning it on vibrate. 

However, if your iPhone is on vibrate, you may be wondering if that alarm you set to get you up in time for work in the morning will still sound. 

Good news: the answer is yes. 

Regardless of whether you've turned off your iPhone's ringer or turned your iPhone on silent and chose to only have it vibrate, any alarms you set will still sound aloud. 

However, if you're concerned about how audible those alarms will be, it may be worth it to ensure that your alarm is on its loudest setting. Here's how to do it. 

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How to make sure your alarm sounds when your iPhone is on vibrate

1. On your iPhone's home screen, tap the Settings app, which appears as a gear icon. 

2. Tap the Sounds & Haptics menu to open your device's sound settings. 

3. Under the Ringer And Alerts option, slide the volume bar to the right to make the volume louder. Doing this will increase the volume of your alarms while your iPhone is on vibrate. 

4. Next, you'll need to make sure you have an alarm ringtone set. Open the Clock app from your iPhone's home screen and tap Edit in the upper left-hand corner of your screen. 

5. Tap the alarm you wish to edit and look at the Sound option. Tapping this will allow you to choose a ringtone for your alarm. You can choose a song from your iPhone or one of the preset ringtones – just make sure you don't have "None" selected on the bottom of the screen.

Related coverage from How To Do Everything: Tech:

• 'Why won't my iPhone ring?': 7 ways to fix an iPhone when its sound isn't working properly

• How to make custom ringtones for your iPhone

• How to mute the sound on your iPhone by turning on silent mode and lowering the volume

• How to turn off vibration on your iPhone in 3 steps, or choose when you want your iPhone to vibrate

Jennifer is a writer and editor from Brooklyn, New York, who spends her time traveling, drinking iced coffee, and watching way too much TV. She has bylines in Vanity Fair, Glamour, Decider, Mic, and many more. You can find her on Twitter at @jenniferlstill.

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On the feature phones I used to have, I could set the alarm clock, then turn the phone "off": the alarm clock would trigger at the set time anyway. Can I do this on iPhone?

By "off" (in quotes, because, we know that from electrical point of view, some parts of the phone stay powered) I mean the state of the phone you get when it is turned on, then you press the power button for a couple of seconds, then a red slider appears saying "slide to power off" and then you slide it.

asked Jun 24, 2014 at 16:13

3

Playing the Clock alarm sound requires the main application ARM processor/CPU to be running the OS and Clock app. When you "slide to power off", power to the main CPU, radios and audio amplifier is removed. So, although the iOS device keeps time (as long as the battery isn't completely dead yet), it can't run the Clock app to play any sound.

When you just "lock" the device (quickly tap the top button and the display turns off), the CPU still occasionally gets power (something like a few times per second), and the audio circuits can be powered and active (to allow background music, etc.), so alarms can go off in that state.

answered Jun 25, 2014 at 1:44

1

The alarm will not ring since that code runs on hardware that is powered off and a software stack that is shut down at that point.

The only two items that will start an iOS device that has gone through the slide to power off "power down" process is plugging in to power and pressing the lock/wake button.

Nothing functions on the hardware in this state except the real time clock component and the hardware responsible for powering up the device / responding to USB power being applied to initiate charging and power up.

answered Jun 25, 2014 at 14:47

bmike♦bmike

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Nop, it can't. The simple reason is because you turn off the power. So there is no way to count time and to know when it should ring

answered Jun 24, 2014 at 16:19

Thomas AyoubThomas Ayoub

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To answer your question in a short manner...

No, when you shutdown you iPhone by holding the power button and sliding to power off you are completely disabling your iPhone. Same with the battery being dead.

It will not turn on to wake you up. It will stay off nothing will happen.

It will only wake you up if it has battery power and is turned on.

answered Oct 26, 2014 at 22:04

Tre STre S

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