Why can't Huawei mobile phones send and receive text messages and make phone calls?

If you mean that the mobile phone can't send short messages, you can try to restart the mobile phone or change it to test it to see if there are any of the following situations:

(1) SMS center number is set incorrectly, please re-enter the correct SMS center number;

(2) No signal or insufficient battery power;

(3) The mobile phone shields the short message sending function;

(4) blacklisted by SMS;

(5) Insufficient quantity balance.

If you don't receive SMS or verification code, it may exist in the following situations:

(1) Check whether the mailbox is full; If yes, please delete some information;

(2) If you still can't get it after deleting it, I suggest you change the machine or card to see if it is caused by hardware;

(3) Check whether it is intercepted by mobile phone interception software;

(4) Check whether the cell phone signal is normal, and try to test whether it can be received in other places.

The common reasons why mobile phones can't answer calls and their solutions are as follows:

(1) Check whether the mobile phone is in arrears, and suggest paying for recharging;

(2) Check whether the mobile phone is set with call forwarding, flight mode on, call barring, etc. Suggest canceling and try again;

(3) Check whether the function or signal of the mobile phone is normal, and suggest to change the mobile phone or try again;

(4) Try to restart or replace the mobile phone to see if you can answer the phone;

(5) Carry the mobile phone card to the local business hall for testing or replacement.

If the above reasons can't solve the problem, I suggest you contact Unicom's manual customer service to verify the handling. The actual situation is subject to local policies.