What happened to Unicom's mobile phone card? Been on the phone.

If your Unicom mobile phone card has been on the phone, there may be the following reasons:

1. Weak signal: Check whether there is enough signal coverage in your place. If the signal is weak, you can try to move to a good place and redial.

2. Network problem: If you are using a data call (such as VoLTE), it may be a network problem. You can try to switch to normal voice call and see if it can solve the problem. If the problem persists, you can try to restart your phone or wait a while and try again.

3.SIM card failure: If the above methods have not solved the problem, you can try to take out the SIM card and insert it again. If the problem still cannot be solved, there may be something wrong with the SIM card itself. You can contact Unicom customer service for card maintenance or replacement.

If the above methods can't solve the problem, it is recommended to contact Unicom customer service for further help.