Why Unicom 3g card SMS reply access code error, how to solve it?

If you can't send and receive SMS, you can try to restart your phone or change it to test it, and check whether the following conditions exist:

1, SMS center number is set incorrectly;

2. There is no signal or the mobile phone battery is insufficient;

3. Blacklisted by SMS;

4. Insufficient quantity balance;

If the above situation is still unresolved, it is recommended to contact the local manual customer service for handling.