Smartwatch won't sync data with phone

Symptoms

• Activity, steps, or heart rate data isn't showing up in the app
• Sync spinner runs forever without completing
• Data syncs late, sometimes a day behind
• App shows 'last synced' from days ago

Likely causes

• CommonCompanion app not running in the backgroundPhones can restrict background activity to save battery, blocking sync.
• CommonBluetooth connection droppedSync requires an active connection between watch and phone.
• PossibleApp or watch software out of dateSync protocols can break between mismatched app and firmware versions.
• PossibleAccount or login session expiredA logged-out or expired session on the app can silently stop syncing.
• Less commonWatch storage full, preventing new data from queuingRarely the watch itself can't hold more unsynced data.

What to do

1. Open the companion app manually and pull down to force a sync.
2. Confirm the watch shows as connected via Bluetooth in the phone's settings, not just charging.
3. Check that the companion app has background app refresh and battery optimization exceptions enabled.
4. Log out and back into your account in the companion app.
5. Update both the app and the watch's firmware to matching current versions.
6. Restart both the watch and the phone if syncing still fails.

When to call a pro

If sync failures persist after updates and a restart, and you suspect data is being lost permanently, contact the manufacturer's support before factory resetting.

Safety