Solution steps:
1. Make sure the signal is normal and turn off airplane mode;
2. Check whether the SIM card status is normal;
3. Check whether the send button is bright and clickable;
4. If you cannot click send after entering text, and the "Send" button is still gray and cannot be clicked, please set "SMS" in Turn off "Show subject bar";
5. If you send text messages to multiple people and enter the numbers manually, please make sure you use line breaks instead of spaces to separate each number.
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