Why does my mobile phone sometimes send short messages quickly, and sometimes it can't send short messages at all? What is the reason?

1, first confirm whether the mobile phone is in flight mode, and then contact the operator to check whether the mobile phone is down. Through these two, you can basically figure out whether it is a mobile phone or an sm card.

2. If there is something wrong with the mobile phone, first enter the SMS settings to see if there is something wrong with the number of the SMS center. You can call the operator's customer service phone to ask the number of the local SMS center, or you can inquire online. If you still can't send SMS after setting it up, there should be something wrong with the SMS application of your mobile phone.

Because of the heavy network load, the mobile phone can't send short messages. Need to contact telecom customer service to confirm whether it is caused by network load problems.