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 your mobile phone can't send text messages, the first reaction is to check whether there is any arrears ~
2. The other party has set up 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.
Step 4 send in large quantities
There is another situation, that is, you have sent a lot of short messages recently, which were judged as advertisements or spam messages, so you 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 sending SMS. It's best to clean up short messages regularly.
Extended data:
Frequently asked questions about the use of mobile phones:
First, the mobile phone can't receive text messages.
Reason:
1. Please check whether the mailbox is full first. If it is full, please delete some information.
2. If you still can't get it after deleting it, you can change the machine or card to see if it is a hardware factor.
3. After eliminating the above reasons, you can try to test whether it can be received in other places to see if it is the reason for the weak local signal.
Second, the mobile phone suddenly has no signal, showing "no service"
The treatment method is as follows:
1. This situation may be caused by poor ambient signal or signal blind area. At this time, no signal is normal. It is recommended to move around to find a place with good signal or leave the signal blind area.
2. It is also possible that the system that comes with the mobile phone is out of order. At this time, you can turn off the phone and turn it on again, so that the phone can automatically connect to the network.
3. In addition, it is also possible that the local mobile operator may have problems with the signal transmission tower for some reasons, such as thunderstorm weather and typhoon weather. In this case, operators can only wait for emergency repair before accessing the network.