My Billie Billie Unicom card suddenly can't send text messages, make phone calls, get online, and the card signal on my mobile phone is full.

Encounter the above problems, you can try to solve them in the following ways:

1. Restart the phone to test it;

2. Plug in the mobile phone card again. Is the check card slot loose or deformed?

3. Change the card and do a mobile phone test to find out whether there is something wrong with the mobile phone card or the terminal;

4. Verify whether the status of the mobile phone card is normal.

If the above methods still can't solve this problem, you can suggest contacting the local Unicom customer service or consulting the official mobile phone customer service.