The China Unicom mobile phone card cannot make calls or send text messages. Even 10010 cannot be reached. There should be no arrears! I can receive text messages.

1. Check whether the function or signal of the mobile phone is normal. It is recommended to change the mobile phone or location and try again; 2. If it cannot be used when roaming to other places, it is recommended to check whether the local network signal is normal and whether the number has been authorized for roaming; 3. Try to restart or change the mobile phone to see if it can answer calls; 4. Bring the mobile phone card to the local business office for testing or replacement of the mobile phone card.