When calendar events stop syncing on your OnePlus 15, schedules can disappear, reminders may not update, and changes made on other devices never show up. This usually happens silently, which makes it easy to miss until you realize important events are missing. The good news is that calendar sync issues are almost always caused by account, background, or permission settings, and they are easy to fix once you know where to look.
Why Calendar Events Are Not Syncing on Your OnePlus 15
- Calendar sync is turned off for your Google account.
- Background activity is restricted for the Calendar app.
- Battery optimization is preventing regular syncing.
- Network connection is unstable or limited.
- The calendar account is not selected or is corrupted.
1. Make Sure Calendar Sync Is Enabled for Your Account
Calendar apps rely on account sync to pull events from the cloud. If sync is turned off, events will stay local and never update across devices.
Open Settings, and then tap Passwords and accounts.
Tap your Google account, and then tap Account sync.
Make sure Calendar is toggled on, and wait a few seconds for sync to refresh.
2. Check Network Connectivity
Calendar syncing requires a stable internet connection. If your data or Wi-Fi connection is weak, sync may pause without showing an error.
Open Settings, and then tap Wi-Fi and network.
Tap Wi-Fi or Mobile network, and confirm that you are connected to a stable network.
Switch networks if needed, then reopen the Calendar app.
3. Allow Background Activity for Calendar
If background activity is restricted, the Calendar app cannot sync unless you open it manually. This is common on phones with aggressive battery management.
Open Settings, and then tap Apps.
Tap App management and select Calendar.
Tap Battery usage, and allow background activity.
4. Disable Battery Optimization for Calendar
Battery optimization can delay or block syncing to save power. Disabling it for Calendar allows events to update in real time.
Open Settings, and then tap Battery.
Tap App battery management, and select Calendar.
Choose Unrestricted or Allow background usage, depending on your options.
5. Check Which Calendars Are Visible
Sometimes events are syncing correctly, but the calendar itself is hidden. This makes it look like syncing is broken when it is not.
Open the Calendar app, and then tap the menu icon.
Tap Manage calendars, and make sure your Google calendar is checked.
Return to the main view and check if events appear.
6. Restart the Calendar Sync Service
Refreshing the app can resolve temporary sync conflicts. This helps when events suddenly stop updating.
Open Settings, and then tap Apps.
Tap App management and select Calendar.
Tap Force stop, then reopen the app and wait for sync to resume.
7. Restart Your Phone
A restart refreshes background services and network connections. It often resolves sync issues caused by temporary system glitches.
Press and hold the Power key, and then tap Restart.
Wait for the phone to boot up fully.
Open Calendar and give it a minute to sync.
Once syncing is restored, your OnePlus 15 should keep calendar events updated across all devices. Most issues come down to sync permissions or battery restrictions, and fixing those usually solves the problem immediately.
FAQs
How long does calendar sync usually take on OnePlus phones?
Syncing typically happens within seconds when the internet connection is stable. Larger calendars or recent changes may take a minute.
Can battery saver mode stop calendar syncing?
Yes. Battery saver can limit background syncing, which prevents events from updating unless the app is opened manually.
Do I need to reinstall the Calendar app to fix sync issues?
In most cases, no. Sync and battery settings resolve the issue, and reinstalling is rarely necessary unless the app itself is corrupted.
