iPhone Calendar Reminder Not Working: Here’s All Troubleshooting

Last Updated on Jan 10, 2021

Why are my Calendar reminders on my iPhone not working? Apple’s iOS device comes with a built-in calendar app that provides a lot of essential features so beneficial for all. The Calendar app has options to add and set birthday, Events, and All- day events reminders, besides, you can also sync other third-party apps with the available official Calendar app. there is an easy way to set up Calendar event and its alert, too.

we are happy to help you, submit this Form, if your solution is not covered in this article.

However, Sometimes numerous users encounter issues concern iPhone Calendar reminders not working. Since definitely, we know while the alert has not arrived at the right time on the iPhone screen, then the users will miss their event. So to fix an issue, we come here with potential answers, that would help you to resolve your painful iPhone Calendar notifications running iOS 12 or later problem. Sometimes OTA update arrives with the bug, and so that updating iOS via iTunes/Finder does solve a couple of problems.

You Should try these best Calendar Apps for iPhone.

All Possible Clues to fix iPhone Calendar Alerts Not Working: iPad, iPad Pro, iPod

Fix #1. Make Sure Calendar Alerts ton isn’t None

You have to need the following given steps carefully to fix iPhone Calendar Alert not working.

  • Step 1. Go to Settings App on iPhone, iPad or iPod Touch.
  • Step 2. Find Sounds & Haptics. [Note: Don’t look on the screen if you have iOS 11 or later phone]
  • Step 3. Now scroll down the screen Tap on Calendar Alerts.
  • Step 4. Make sure that Calendar Alert Tones switch isn’t None (Mute).iPhone Calendar Alert Tones screen

If switch set None then please choose available other sound tones Or keep continues following Steps.

You can also choose Ringtones to your iPhone Calendar Alerts. Besides, on the bottom of the Calendar Alerts screen, you can see Classic tones, there are wonder tons such as real Alarm, Bark, Belltower, Blues, Crickets, Doorbell, Duck, Robot, Sci-Fi, Timba and more.

Fix -2 Check out iPhone Calendar Notifications Settings

Please change Notification Alert style and Sound too.

  • Step 1. Go to the Settings app on your iDevice home screen. More, you can also use Spotlight search to find Settings App quickly.
  • Step 2. Tap on Notifications.
  • Step 3. Hit on Calendar.
  • Step 4. Turn toggle Allow Notification ON/Green.
  • Step #5. Now you can see various sections on-screen including Upcoming Events, Invitations, invitee Responses, Shared Calendar Changes, and Event found in Mail.

Now, choose one of this to make a change such as Allow Notifications, Calendar Alerts style (on Lock Screen, Alert Show or hide in Notifications Center, Banners Style) Sounds (tap on Sounds and update Settings like vibration, Alert Tones, choose Ringtones as Calendar Alert), Enable Badges to show the number of Alerts on Calander App icon on Phone or iPad’s Home Screen.

You can see the last Section called Options: “Show Previews” (Choose: (Always Default) if you keep when locked then you get alert only your Phone locked screen, and if you go with never then you never get calendar alert preview). That’s why I suggest choose Always default option.

Tunn on iPhone Calendar Notifications

Here, you can see all toggles for Apple’s Official iOS calendar app notifications settings.

Note: in case you are using Phone with headphones at that moment your iPhone calendar notifications alert doesn’t work while Bluetooth headphones connected to the iPhone. So remove headphones and test again. Still, the problem persists then go to the next solution.

Fix #3. Change Default Alert Times

  1. Open Settings App on iPhone/iPad > Scroll the screen Tap Calendars.

    Calendar Settings in iPhone Settings app

    Calendar Settings in the iPhone Settings app

  2. Tap Default Alert Time – Birthday, Events, All-Day Events
  3. Set your Reminder Time Just before a Day, Birthday Reminder should be on Day, Event Reminder Just Before a day or Event Reminder you can set as of your need.

    Set Event Reminder Time from iPhone Calendar Settings

    Set Event Reminder Time from iPhone Calendar Settings

  4. That’s it.

For iOS 10 and earlier iOS users Settings >  Mail, Contacts Calendar > Default Alert Time > Birthday, Events, All-Day Events.

Verify that the switch of Alerts isn’t None.Change iPhone Calendar Default Alert Time

Fix 4. Adjust Correct Time Zone

Please, Setup current time zone where you are currently living.

‘’According to a piece of information on Apple Site, the iPhone calendar uses your location, locations of upcoming events, and traffic conditions to tell you when you need to leave to arrive on time at your destination. You will not receive alerts for events with destinations that take more than three hours to reach.’’

Settings >  Mail, Contacts Calendar > scroll down the screen until you see the Calendar label and tap on Time Zone Override > Turn Time Zone Override.

in advance, you should also set up a location-based alert for the calendar App.

Go to Settings App > Privacy > Location Services, then tap an app to turn Calendar alerts ON based on your location.

Adjust Correct Time Zone on iPhone calendar iOS9

Fixes #5. Force Reboot Your iOS Device

Different iPhone modal has a different way to force reboot devices; All iPhone users should follow the bottom given steps to force rebooting devices and get rid of the Phone calendar alert issue.


Method to force reboot For iPhone 11(Pro Max), XS Max, XS, XR, X, iPhone 8, and iPhone 8 Plus users

Press and quickly release the Volume up button, then press and promptly release the Volume down button and in the last press and hold on Side button until you appear Apple logo on the screen. After successfully shutdown Phone, press and hold on Side button again to Turn On your Phone back.

Force Restart iPhone XS max, iPhone XS, iPhone XR when Face id disabled


Method to force reboot iPhone 7 and iPhone 7 Plus users

Lets Press and holding on Power button/ sleep-wake and Volume down button at the same time for 10 seconds and turn off your phone. To turn on the Phone press & hold on the Power button again.


Method to force reboot iPhone 6S and previous iPhone model users

Just press and hold on Power button + Home button simultaneously up to 8 seconds and solve your problem. Don’t forget to press and hold the power button again to turn your iPhone On.

iPhone Calendar Second Alert Not Working 2021

Are you sure you’ve set up the Calendar Second Alert on iPhone? Keep note that the second alert on Calendar is only iCalendar specific feature, meaning it is only Apple’s own Calendar feature.

  1. Open the Settings App.
  2. Tap on Calendar.
  3. Select the Default Calendar.
  4. Choose the On My iPhone calendar as your default.

iCloud and Google Calendar are the only calendars that support the second alert, whereas Outlook App doesn’t support this feature.

How do I turn off second alert on iPhone Calendar?

Don’t know how to disable the second alert on iPhone Calendar? Let’s see how to do it.

  1. Go to the Settings App.
  2. Tap Notifications.
  3. Select Messages App.
  4. Find Repeat Alert and choose Never.

Why does my Calendar Keep Sending me Notifications iPhone?

The situation is even if you haven’t set up the Calendar Alert or Event, but still calendar keeps sending notifications on iPhone? There are few things to check to get rid of spam calendar notifications on the iPhone.

Check for Random Calendar Subscription

  1. Go to the Settings app.
  2. Scroll down to the Calendar app and tap on it.
  3. Under Other or Subscribed, look for any suspicious calendar, if there is any delete it.

Check for Email

  1. Go to the Settings app on the iPhone.
  2. Tap the Mail App.
  3. Tap Accounts.
  4. Delete the Email Account, if you haven’t added it.

Check for Profiles

  1. Open the Settings App.
  2. Go to General.
  3. Tap Profiles.
  4. Look for a strange profile that you haven’t added, and delete it.

iPhone shared calendar alerts not working

Enable Notifications for Calendar on iCloud.com

To get the Calendar Notifications on iPhone, your iCloud must be set up correctly. Here’s how to do it.

  1. Go to iCloud.com.
  2. Click on the settings cog in the upper-left corner.
  3. Select Preferences.
  4. Look for the Advanced pane and from there choose In-app notifications and Save

Now we’ll see a miscellaneous workaround to fix this problem.

  1. First Check the Apple System Status and make sure Calendar, iCloud and Reminders are live and working.
  2. Update all of your Apple devices, including iPhone, iPad, Mac, MacBook, or whatever you have.
  3. Verify the Date and Time on all the devices.
  4. Check Internet Connection.

That’s it!

Even you set up a reminder on iPhone Calendar but that doesn’t ring, I hope all listed ways guide you to clear the iPhone Calendar Reminder not Working. For more information, you can read Apple’s document Get the sweet and sober guide. And share your feedback on our site. Thanks in advance.

Last sort- You guy after attempting above all workarounds, none of the work in your case, then please take a fresh backup copy of your device and then restore like-new Phone. we know the process a little long but hope this trick will give you a 100% positive result.

Anything help needs, please contact us! Please share your feedback in the comment box.

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Jaysukh Patel is the founder of howtoisolve. Also self Professional Developer, Techno lover mainly for iPhone, iPad, iPod Touch and iOS, Jaysukh is one of responsible person in his family. Contact On: [email protected] [OR] [email protected]

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