Nut 3 SMS can't be opened

If there is a signal, you can surf the Internet, but you can send and receive short messages, but you can't answer the phone:

[1] Check whether the mobile phone is in arrears, and suggest to pay for recharging;

[2] Check whether the mobile phone is set to call forwarding, airplane mode on, call barring, etc. It is recommended to cancel and try again;

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

[4] If roaming to other places can't be used, it is recommended to check whether the local network signal is normal and whether roaming permission has been opened for this number;

[5] Try to restart or replace the mobile phone to see if you can answer the phone;

[6] Take the mobile phone card to the local business hall for testing or replacement.