What cell phone bindings does Redmi Watch 4 support and how do I bind them?

Before using Redmi Watch 4, you need to bind it with the Mi Fitness App, which has the same name for iOS and Android, and you can search and download it from the App Store.
The binding method is as follows:
1. Press and hold the power button for about 5 seconds to turn on the watch. Scan the QR code on the screen of the watch with your cell phone, or search the Mi Fitness App in the cell phone Application market to download and install the Mi Fitness App;
2. Open the Mi Fitness App, log into your account according to the page prompts, and open the relevant permissions required by the App;
3. The watch supports three ways to add:
(1). Tap [Sweep] to scan the QR code on the watch screen;
(2). Tap [Add Device]. The App will automatically search for devices that can be added. In the list of searched devices, select the Bluetooth name of your watch. If your watch is not searched in the list, you can try to search again;
(3). Tap [Add Device] >> tap [Add by Model] at the bottom of the page >> select [Redmi Watch 4], and the App will automatically search for Redmi Watch 4 that can be added >> in the list of searched devices, select the Bluetooth name of your watch. If your watch is not searched in the list, you can try to search again;
4. Android phone: When your phone displays the same security code as the screen of your watch, tap [pairing request] on the phone and the watch side respectively to complete the pairing connection with your watch;
iOS cell phone: Firstly, jump to the Bluetooth list of cell phone systems, select the Bluetooth name of your watch, and agree to the pairing request in the security code page popped up on the cell phone and the watch respectively. Then return to App to select the Bluetooth name of your watch, and then carry out the pairing operation once again to complete the pairing connection with the watch.
Note:
Please make sure the Bluetooth of your cell phone is on during the pairing process to ensure the connection between your watch and cell phone is normal.
If the security code has popped up on the watch but the pop-up window to confirm pairing is not displayed on the cell phone, please look for the pairing request in the notification bar of the cell phone.
If you can't find the watch during the adding device process, or can't connect the watch during use, please try to press and hold the watch power button for 3 seconds, select Restore Factory in the system operation interface, and then add the watch again.