Why can't mobile phones always receive text messages in time?

There may be the following reasons for the delay in sending and receiving SMS:

First, the network system is busy. I suggest you try again another time.

Second, because of the mobile phone, you can restart the mobile phone or change it to test it;

Third, long-term shutdown or out of service area;

4.SMS inbox and outbox are full. Please clean them up and try again.

5. The mobile phone is out of service. It is recommended to start again after paying.