How to bind the Xiaomi Watch S3 with the phone?

Press and hold the power button for about 3 seconds to turn on the watch. Use your phone to scan the QR code on the watch screen, or search for the [Mi Fitness] APP in the mobile APP market. Download and install the [Mi Fitness] APP;
2. Open the [Mi Fitness] APP, follow the prompts on the page to log into the Mi account, and enable the relevant permissions required for the APP;
3. Then, you can connect the watch to the phone by the following methods:
(1). Tap [Scanner] icon to scan the QR code on the watch screen;
(2). Tap [Add Device] icon and the APP will automatically search for devices that can be added. In the list of devices found, select the Bluetooth name of your watch. If your watch is not found in the list, you can try searching again;
(3). Open the [Mi Fitness] APP >> [Device] >> [Add device]. In the list of devices found, select the Bluetooth name of your watch. If your watch is not found in the list, you can try searching again.
4. If you are using an Android phone, when the phone displays the same security code as the watch screen, it can complete the pairing connection with the watch by allowing the pairing request on both the phone and watch. If you are using an iOS phone, please go to the Bluetooth list in the mobile phone system, select the Bluetooth name of your watch, and agree to the pairing request on the security code pages that pop up on your phone and watch. Return to the APP and select the Bluetooth name of your watch, then perform another pairing operation to complete the pairing connection with the watch.