How does Samsung Telecom 939d send SMS with C card?

According to your description. Please check according to the following steps:

(1) Please confirm whether the SMS function is enabled;

(2) You can check whether the mobile phone outbox and UIM card memory are full, and try to clear the mobile phone memory and UIM card memory information;

(3) Please replace the mobile phone and test whether it is normal. If the mobile phone is normal after replacement, it is judged as a problem of mobile phone settings or mobile phone quality. For the problem of mobile phone settings, you can check the SMS settings on the mobile phone, whether you have made the SMS sending restriction function, cancel the settings, or restore the factory settings; If there is a quality problem with the mobile phone, you need to consult the manufacturer for maintenance or replace the terminal again.

(4) If the above operations cannot solve the problem, please call 10000 to declare.

Thank you for your interest in telecom products. I wish you a happy life. If you have any other questions, please come to Telecom Zhihu Platform or Telecom official website to ask questions, and more professional customer service will answer them for you.