Your Galaxy Watch Ultra is supposed to mirror your phone in real time, so it stings when notifications stop arriving, your step count freezes, or the watch face shows yesterday's data. The titanium 47mm watch leans on a steady Bluetooth link to your phone through the Galaxy Wearable app, and the moment that handshake slips, syncing stalls. The good news is that almost every sync failure traces back to a battery mode, a Bluetooth hiccup, or stale software, and you can usually clear it in a few minutes. Work through the fixes below in order, starting with the gentlest, and stop as soon as your watch and phone are talking again.
Rule Out Battery Modes Before Anything Else
Power-related modes quietly shut off the very radios your watch needs to sync. If your Galaxy Watch Ultra is in Power saving, Airplane mode, or Watch only mode, it will restrict the features that keep data flowing to your phone. A low charge can also stall transfers, so confirm both devices have a healthy battery first.
Make sure your phone and watch are charged, since a low battery can interrupt transfers.
On the watch, swipe down from the top of the screen, then tap the Power saving icon to turn it off.
Swipe down from the top of the screen again, then swipe to and tap the Airplane icon to turn off Airplane mode.
To exit Watch only mode, go to Settings, swipe to and tap Battery, then tap Power mode and choose Standard.
With those modes cleared, give the watch a few seconds to reconnect and check whether notifications or health data start flowing again.
Re-Establish the Bluetooth Link Through Galaxy Wearable
Your phone and watch sync over Bluetooth, and the Galaxy Wearable app is the manager that holds that connection together. When the link drops, the app is the fastest place to bring it back, and a quick toggle check on both devices often does the trick. Distance matters too, since Bluetooth has a limited reach.
Open the Galaxy Wearable app on your phone. If "Start" is shown, tap it to reconnect the watch to the phone.
On the phone, confirm Bluetooth is on under Settings > Connections > Bluetooth.
On the watch, confirm Bluetooth is on under Settings > Connections > Bluetooth.
Keep the two devices within about 30 feet of each other while they reconnect.
If "Start" appears in Galaxy Wearable, that alone is a strong sign the connection had simply dropped, and tapping it should restore syncing.
Restart the Watch to Clear a Temporary Glitch
A simple restart resolves a surprising number of connection problems by flushing whatever temporary state got stuck. If the watch is responsive, restart it the normal way and let it reconnect to your phone. If the screen is frozen or the watch will not respond at all, you can force a restart instead.
To force restart your watch, press and hold the Home button and the Back button at the same time for at least seven seconds. The screen turns black and the Samsung logo appears, and at that point you can release the buttons. Once the watch finishes booting, open the Galaxy Wearable app to confirm it has reconnected.
Bring the App and Watch Software Up to Date
Outdated software is one of the most common reasons a watch and phone stop syncing, because old versions can fall out of step with each other. Keeping both the companion app and the watch software current is one of the highest-value fixes here. Handle the app first, then the watch.
Open the Play Store and update the Galaxy Wearable app to its latest version.
Open the Galaxy Wearable app and use it to check for and install software updates for your watch.
While you are there, update the apps installed on your watch as well.
After everything updates, restart your watch if prompted and check whether the sync resumes on its own.
Fix Health Data That Will Not Sync
Sometimes everything syncs except your fitness and health stats, which means the issue sits with Samsung Health rather than the core Bluetooth link. Samsung Health uses Samsung Cloud to move health data, so the sync switch and the app version are what matter here. Make both right before troubleshooting anything else for health metrics.
Open Samsung Health on the phone, tap More options (the three dots), then tap Settings.
Tap Sync with Samsung Cloud, turn the switch on, then tap Sync now.
Confirm the app version by going to Samsung Health > More options > Settings > About Samsung Health. It must be version 6.2.0.075 or later.
If the version is older than that, update Samsung Health from the Play Store and run Sync now again.
Grant the Permissions Syncing Depends On
Missing permissions can silently block your watch from syncing, even when Bluetooth looks perfectly fine. The Galaxy Wearable app and Google Play services both need their permissions enabled to keep data moving, so it is worth a quick audit. Check each one in your phone settings.
On the phone, go to Settings > Apps > Galaxy Wearable > Permissions and enable the needed permissions.
Go to Settings > Apps > Google Play services > Permissions and enable any that are currently denied.
Return to the Galaxy Wearable app and try reconnecting.
Google Play services is central to how the watch works, so granting its permissions can resolve sync failures that look like a Bluetooth problem on the surface.
Make Sure Your Phone Is Actually Compatible
This step matters most for anyone who recently switched phones or is troubleshooting on a borrowed device. The Galaxy Watch Ultra works only with Android phones running Android 11 or later. If your phone is running an older version of Android, the watch will not pair or sync reliably until you update it.
If you are trying to use the watch with an iPhone, that is the root of the problem. The Galaxy Watch Ultra is not compatible with iPhones because it relies on Google Play services and the Galaxy Wearable app, neither of which is supported on iOS. There is no setting or workaround that lets it sync to an iPhone at all, so the only fix is to pair it with a supported Android phone.
Unpair and Re-Pair From Scratch
When the connection keeps failing despite everything above, a clean re-pair rebuilds the link from the ground up. Unpairing removes the existing relationship between the two devices, and the Galaxy Wearable app then walks you through setting the watch up again. This often clears stubborn sync issues that toggles and restarts could not.
On the phone, go to Settings > Connections > Bluetooth.
Tap the Settings icon next to your watch, then select Unpair.
Open the Galaxy Wearable app and follow the prompts to set the watch up and reconnect.
Give the setup process a few minutes to finish, since the app restores your watch configuration as part of reconnecting.
Factory Reset as a Last Resort, Then Contact Support
A factory reset is the final do-it-yourself step, and it is destructive, so treat it carefully. Resetting erases all personal data on the watch and restores its default settings, which is why you should back up first. Back up the data on your watch using the Galaxy Wearable app before you begin.
Keep one important detail in mind. If you reset the Galaxy Watch from the watch itself, some watch data may still remain saved on your mobile device, so resetting through the Galaxy Wearable app is the preferred method when possible.
- 1.Back up the watch first using the Galaxy Wearable app.
- 2.On the watch, go to Settings > General > Reset.
- 3.Tap Reset to confirm. This erases all personal data and restores default settings.
If syncing still fails after a reset and re-pair, the problem likely needs service. Contact Samsung Support to arrange a repair or further help.
Frequently Asked Questions
Why does my Galaxy Watch Ultra keep losing its connection to my phone?
The most common causes are a battery mode that disables the radios, Bluetooth being off on one device, or the two devices drifting too far apart. Make sure Power saving, Airplane mode, and Watch only mode are off, confirm Bluetooth is enabled on both the phone and the watch, and keep them within about 30 feet of each other.
Can I use the Galaxy Watch Ultra with an iPhone?
No. The Galaxy Watch Ultra is not compatible with iPhones because it relies on Google Play services and the Galaxy Wearable app, neither of which is supported on iOS. It pairs only with Android phones running Android 11 or later.
My steps and heart rate are not updating but notifications work. What should I check?
That points to Samsung Health rather than the main Bluetooth link. Open Samsung Health on the phone, tap More options (three dots) > Settings > Sync with Samsung Cloud, turn it on and tap Sync now, and confirm the app is version 6.2.0.075 or later.
How do I force restart the watch if it freezes during a sync?
Press and hold the Home button and the Back button at the same time for at least seven seconds. The screen turns black and the Samsung logo appears, and at that point you can release the buttons and let the watch reboot.
Will a factory reset erase my watch data?
Yes. A factory reset erases all personal data and restores default settings, so back up the watch using the Galaxy Wearable app first. Note that resetting from the watch itself may leave some data on your phone, which is why resetting through the Galaxy Wearable app is the preferred method.