I sent a text message and didn't reply.

First of all, confirm whether the flight mode is turned on, whether there is a signal, and whether there is arrears. In these three cases, SMS can't be sent out;

2. If the other party's mobile phone is turned off, there is no signal, there is arrears, or you are blacked out, you can't send text messages;

How to solve it?

1. Restart the phone, sometimes it may be some minor problems, just restart it;

2. You can test the SIM card on other mobile phones to see if it is a mobile phone problem or a SIM card problem;

3. Call the SIM card operator's customer service phone, and let the mobile phone terminal transfer it manually to analyze and solve it for you.