Why is the sending and receiving of SMS delayed?

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

1, the network system is busy, I suggest you try again another day;

2, mobile phone reasons, you can restart the phone or change the phone to test it;

3. Long downtime 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.

The above reasons have not been solved after being eliminated. Please contact the labor [link submission = "transfer to labor"] for consultation.