The Xiaomi Mi Smart Band 4 connects to a phone through its companion app and Bluetooth. Pairing lets the band synchronize activity data, update its time and date, receive supported alerts, apply settings, and receive available device updates.
[reference] Title: Companion App Text: Depending on app naming, region, or version, the Mi Smart Band 4 may be managed through Mi Fit or Zepp Life. Title: Bluetooth Text: Bluetooth must remain enabled while the band is being discovered and paired. Title: Pairing Confirmation Text: When the band vibrates and shows the pairing request, confirm it on the band display. Title: Sync Text: After pairing, the app can synchronize activity records, settings, time, and supported smart features. [/reference]What the Connection Enables
Pairing gives the companion app access to the band features that depend on synchronization or phone communication.
- Step and activity history
- Heart rate data synchronization
- Sleep records
- Workout and exercise logs
- Incoming call alerts
- Supported app notifications
- Alarm settings
- Weather information when configured
- Band display and menu settings
- Band face selection where available
- Firmware updates
- Find Band or Find Phone features when available
- Automatic time and date synchronization
Before pairing, some information may be unavailable or incomplete. Features such as phone alerts, long-term account history, and automatic time synchronization depend on a working connection.
Before Pairing
Phone Compatibility
The Mi Smart Band 4 requires a compatible phone with Bluetooth support and a companion app version that can manage the band.
Older phone software, heavily modified system software, restricted permissions, or aggressive battery-saving settings can affect discovery, synchronization, or background alerts. Updating the phone software and companion app may help maintain compatibility.
Install and Open the Companion App
Install the supported companion app from your phone's app store. Depending on the app version or region, you may see the name Mi Fit or Zepp Life.
If product materials include an app QR code, it may also direct you to the appropriate app. Use an up-to-date app version so the available device support, synchronization, and update functions are current.
Sign In
Open the companion app and sign in with an existing compatible account, or create one if required by the app.
- Use an email address or phone number you can access.
- Keep your account details available for future phone changes.
- Select the appropriate region if the app requests it.
- Use a stable internet connection during sign-in.
- Allow the basic permissions required for device discovery and pairing.
The signed-in account can be used to store synchronized fitness history, goals, device settings, and connected-device information.
Allow Relevant Permissions
The permissions shown during setup can vary with phone software and app version. Grant the permissions needed for the features you plan to use.
- Bluetooth or nearby-device access: used to discover, pair, and synchronize the band.
- Location access: may be requested by some phone software for device scanning or weather-related functions.
- Notification access: needed for supported phone alerts on the band.
- Background activity: helps synchronization and alerts continue when the app is not open.
- Phone access: may be requested for incoming-call alerts.
- Contacts access: may be used to display caller information.
- Storage or file access: may be requested for certain app or update functions.
Pair the Band
[step] 1. Open the device section in Mi Fit or Zepp Life. 2. Choose Add Device, Pair Device, or the available add-device control. 3. Select Band from the device list. 4. Keep Bluetooth enabled and place the Mi Smart Band 4 close to the phone. 5. Wait while the app searches for the band. 6. When the band vibrates and displays the pairing request, confirm it on the band screen. 7. Keep the app open while the connection and initial synchronization finish. 8. Check that the Mi Smart Band 4 appears in the app's connected-device list. [/step]During pairing, avoid moving the band far from the phone or turning Bluetooth off. In an area with many nearby Bluetooth devices, moving to a less crowded location can make it easier to identify the correct band.
Confirm the Connection
After pairing, open the Mi Smart Band 4 device page in the app. The device page should provide access to available information such as battery status, synchronization, and band settings.
You can also check the connection by changing a simple band setting, setting an alarm, or using Find Band if that option is available. The change or vibration should reach the band while it is connected.
First-Time Settings
Once the connection is active, review the settings you want to use each day.
- Profile information: review details such as height, weight, age, and gender if the app offers them.
- Step goal: choose the daily activity target you want to use.
- Heart rate monitoring: enable or adjust available monitoring settings.
- Sleep tracking: review the available sleep options.
- App alerts: choose which supported apps may send alerts to the band.
- Incoming calls: enable call alerts if desired.
- Alarms: create vibration alarms.
- Weather: enable the permissions or settings required for weather information if supported.
- Display: choose the available menu or display options.
- Band face: select an available watch face if the app provides this option.
Bluetooth and Range
Bluetooth must be enabled during pairing. After setup, the band can normally reconnect when it is within usable Bluetooth range and the companion app is allowed to communicate in the background.
Distance, walls, wireless interference, phone power-saving settings, and disabled permissions can reduce connection stability.
After Pairing
The band begins synchronizing supported information with the companion app. Time and date should follow the connected phone, while activity information can be stored in the app for daily, weekly, and longer-term viewing.
Depending on your settings, synchronized information can include steps, workouts, heart rate, sleep, alarms, and supported alerts. The app also provides settings that are not fully adjustable from the band itself.
Phone Notifications
[step] 1. Open the Mi Smart Band 4 device page in the companion app. 2. Open App Alerts, Notifications, or the equivalent alert setting. 3. Allow notification access if requested. 4. Choose the supported apps whose alerts you want on the band. 5. Save or leave the settings screen after the changes are applied. [/step]If alerts are enabled but do not appear, review notification access, background activity permissions, the selected app list, and any Do Not Disturb setting that may suppress alerts.
Keep the Connection Stable
[dosdonts] Do: Keep Bluetooth enabled when you want the band connected Do: Keep the companion app installed and signed in Do: Allow the app to run in the background when synchronization and alerts are needed Do: Review battery restrictions if the app is frequently stopped Do: Keep the band within practical Bluetooth range Do: Keep the companion app updated Dont: Close the app during first-time pairing or a device update Dont: Move the band far away while pairing is still in progress Dont: Ignore the confirmation request shown on the band Dont: Try to pair a band that is still linked to another account without first removing that link [/dosdonts]Basic Connection Checks
[troubleshoot] Problem: The app does not find the band Cause: The band may be too far away, have low battery, Bluetooth may need to be refreshed, or the band may still be linked elsewhere Fix: Bring the band close, check its battery, turn Bluetooth off and on, reopen the app, and search again Problem: The band does not vibrate during discovery Cause: The app may not have detected it yet, another similar device may be nearby, or the band may already be associated with another phone or account Fix: Keep the band close, move away from other nearby Bluetooth devices if practical, and check its existing connection status Problem: The pairing request appears but does not complete Cause: The confirmation may not have been accepted on the band before the request expired Fix: Start the pairing flow again and confirm the request promptly on the band screen Problem: Bluetooth is enabled but the band does not connect Cause: A temporary Bluetooth state, restricted app permissions, or background restrictions may be interfering Fix: Reopen the app, refresh Bluetooth, review the app permissions, and restart the phone if needed Problem: The app says the band is already paired Cause: The Mi Smart Band 4 may still be linked to another phone or account Fix: Unpair it from the previous connection before starting a new pairing attempt Problem: The band is connected but phone alerts do not appear Cause: Notification access, background activity, selected app alerts, or Do Not Disturb settings may be limiting alerts Fix: Review those settings in the companion app and phone settings [/troubleshoot]Reconnect After a Disconnection
When the Mi Smart Band 4 moves back near its paired phone, opening the companion app can help it reconnect and synchronize.
- Bring the band close to the phone.
- Confirm Bluetooth is enabled.
- Close and reopen the companion app if needed.
- Restart the phone if Bluetooth remains unstable.
- Charge the band if its battery is low.
- Confirm the app is allowed to operate in the background.
Move the Band to a New Phone
If you still have access to the previous phone, open the Mi Smart Band 4 device page in the companion app and choose Unpair. Then install the companion app on the new phone, sign in, and pair the band again.
Using the same account may allow previously synchronized fitness information to appear again, depending on the account and app settings.
[warning] If the previous connection cannot be removed normally, a band reset may be required before a fresh pairing attempt. A reset can remove local settings and unsynchronized information. [/warning]Unpair the Band
Unpairing removes the active connection between the Mi Smart Band 4 and its current app account. This can be useful before changing phones, transferring the band to another user, or starting a fresh connection.
[step] 1. Open the companion app. 2. Open the Mi Smart Band 4 device page. 3. Scroll to the available device-management options. 4. Select Unpair. 5. Confirm the action. 6. Wait until the band is removed from the account. [/step]Reset Only When Needed
If repeated basic checks do not allow a fresh pairing, the band may provide a reset option in its menus. Depending on the firmware, this may appear under More, Settings, or a similarly named system section.
Complete a synchronization first when possible. Resetting can clear local settings and information that has not yet synchronized.
Device Updates
After pairing, the companion app may check for available firmware updates. If an update is offered, keep the connection stable until it finishes.
[checklist] * Band has enough battery * Band remains close to the phone * Bluetooth stays enabled * Companion app remains open when required * Update is allowed to finish before either device is restarted [/checklist]If an update does not complete, return to the app when the band has sufficient battery and a stable connection before trying again.
Connection Reminders
- Pair from the companion app rather than relying only on the phone's Bluetooth menu.
- Keep Bluetooth enabled during setup.
- Keep the band close to the phone until pairing finishes.
- Respond to the confirmation shown on the band.
- Review required app permissions instead of denying them automatically.
- Use a current companion app version.
- Allow background activity when continuous sync or alerts are needed.
- Remove an old account or phone link before transferring the band.