The reason may be that the authentication of Apple's mobile phone master card in Unicom service authorization server failed, and it was impossible to handle Unicom communication services for watches, or it was impossible to see the Unicom communication services that had been handled.

Suggestion:

(1) First, I tried to plug in the main card several times. If it fails, you can try to restart your phone.

(2) Check whether the user's mobile phone is above iPhone6, whether the IoS version is above11.0 (AW3)/12.0 (AW4), and whether the operator version is above 29. 1;

(3) Unbind the watch from the mobile phone and match it again;

(4)iWATCH is a genuine product of the Bank of China, not an overseas version.

(5) If none of the above works, I suggest you bring the original ID card to the nearest Unicom business hall for consultation.