What is the reason why mobile phone information can't be sent out? What is the reason for this?

1, mobile phone arrears: there is still a charge for calling and texting these days. If the phone is in arrears or even turned off, you can't send text messages. So when you can't send a text message, the first reaction is to check whether you owe money.

2. The other party has a firewall: If the number you want to send has a firewall, your message will be rejected. In this case, it will show that the delivery was successful and the receipt failed. Although the other party can't receive it, it will still charge you the SMS fee.

3. Signal problem: Although there will be network coverage in most places now, network instability is inevitable. When your short message can't be sent out, it is likely that the network is not good or there is no coverage. Moving a place or restarting your mobile phone may solve the problem.

4. Mass sending: There is another situation, that is, you recently sent a large number of short messages, which were judged as advertisements or spam messages, so they were intercepted. In this case, your mail is not undeliverable, but undeliverable, and it is classified as spam by default.

5. Insufficient memory: Whether it is your outbox or draft box, if the memory of your mobile phone is full, it may also lead to the failure of SMS sending. It's best to clean up short messages regularly.