1. Open the mobile Business Hall APP and click \"eSIM Zone\".
2. On the eSIM service screen, tap Xiaomi eSIM Watch.
3. Access the watch eSIM service and tap No. 1 Dual-Terminal Enable.
4. On the Device page, click Add Device.
5. Enter your ID number and verification code and click \"Next\".
6. If the authentication is successful, click \"Open Account Now\".
7. As prompted, click \"Confirm\".
8. Wait for a few minutes, and the message \"Business processing completed\" is displayed. Click \"Close service\".