When calendar events stop syncing on the Samsung Galaxy S25 Ultra, appointments may disappear or fail to appear across your devices. This can cause missed meetings, reminders that never trigger, or schedules that look incomplete. In most cases, the problem is related to sync settings, account permissions, or temporary network issues in One UI 7.
The good news is that you can usually restore calendar syncing in just a few minutes.
Why Calendar Events Are Not Syncing on the Samsung Galaxy S25 Ultra
- Sync is turned off for the Samsung or Google account.
- Internet connection is unstable or disabled.
- The Calendar app sync option is turned off in account settings.
- Background data restrictions are preventing updates.
- Temporary software glitches affecting sync services.
Check if Calendar Sync Is Enabled
Calendar apps rely on account synchronization to update events between devices. If sync is disabled, your phone will stop sending or receiving new events.
Open Settings, and then tap Accounts and backup.
Tap Manage accounts, and then select your Google or Samsung account.
Tap Sync account, and then make sure Calendar sync is turned on.
Refresh the Sync Connection
Sometimes the sync process becomes stuck in the background. Turning the sync option off and back on forces the device to reconnect with the calendar servers.
Open Settings, and then tap Accounts and backup.
Tap Manage accounts, and then choose the account used for your calendar.
Tap Sync account, and then toggle Calendar off and back on again.
Make Sure Internet Access Is Working
Calendar syncing requires a stable internet connection. If your phone is offline, events will not update across devices.
Open Settings, and then tap Connections.
Tap Wi Fi, and then connect to a stable network.
If you use mobile data, open Settings, and then tap Connections.
Tap Data usage, and then make sure Mobile data is enabled.
Allow Background Data for the Calendar App
If background data is restricted, the Calendar app cannot update automatically. This often prevents events from syncing until the app is opened manually.
Open Settings, and then tap Apps.
Tap Calendar, and then tap Mobile data.
Turn on Allow background data, and then enable Allow data usage while Data saver is on.
Restart the Phone
Temporary system glitches can interrupt syncing services. Restarting the device refreshes background processes and reconnects the phone to Samsung and Google servers.
Swipe down from the top right of the screen, and then tap the Power icon.
Tap Restart, and then wait for the phone to boot back up.
Calendar syncing should work normally again once your account settings and connections are refreshed. If events still fail to appear, signing out of your account and signing back in often restores the connection.
FAQs
Why are my calendar events showing on my computer but not on my phone?
This usually means account sync is disabled on the phone. Turning on Calendar sync in your account settings will allow the events to appear again.
Do I need internet access for calendar syncing to work?
Yes. Your Samsung Galaxy S25 Ultra needs an active Wi Fi or mobile data connection to send and receive updated calendar events.
Why are some calendar events syncing but not others?
This can happen if multiple calendars are linked to your account. Make sure the correct calendar is enabled in the Calendar app settings so all events are visible.
