What is the reason why the SMS can't be delivered?

There are many reasons why users use mobile phones to send text messages. The first reason is the internet. Users can check whether their mobile phone is in flight mode, or turn it off and restart it, and then send text messages in places with good network signal, which can solve the problem.

Or it's the sim card of the mobile phone. If the sim card is damaged or improperly placed, the SMS will not be sent. In this case, you need to take out the sim card of the mobile phone and see if the chip of the sim card is dirty or foreign. Try to wipe it, pay attention to the location of the sim card when installing it, and try again after installing it correctly.

Data expansion: ShortMessageService (SMS for short) refers to the text or digital information directly sent or received by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters.