What is the reason why the old machine can't send short messages?

Reason for not sending SMS: The number of SMS information center may be modified, which makes it impossible to send SMS.

Specific steps:

1, open the SMS settings;

2. Find the information center in the SMS settings;

After opening, you will see the number of your information center. If it is not a string number of +86, then this is one of the reasons why you failed to send SMS.

4. Enter +86 13800***500 in the number column of the information center, and click OK;

5. Then click resend on the message that failed to send;

6. After modifying the correct information center number, SMS can be sent immediately;

7. If you don't understand the operation, you can directly dial 10086 to check the corresponding information center number.