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Abnormal setting of SMS center number may cause iPhone to be unable to send SMS or even activate iMessage. Let's learn how to query, modify and delete the SMS center number of iPhone.

Possible reasons for the failure of SMS sending:

● If the number of the current SMS service center is set incorrectly or modified, the SMS will not be sent. If sending fails for many times, please check whether the number of the SMS service center is set abnormally.

● After a short message is submitted to a communication operator, a large number of short messages are usually sent at the same time, and there may be some delay, especially during holidays. If the short message contains bad content, the submission may fail and the relevant results will be fed back to the user.

● After the operator successfully sends the SMS, it will receive the number when the SMS has been sent. Due to the interception of mobile phone firewall and mobile phone housekeeper software, the other party may not be able to receive SMS successfully.

How to modify the number of SMS center?

Excluding the operator and other factors, the biggest possibility of SMS sending failure is the abnormal number setting of SMS center. Let's take a look at how the iPhone modifies the SMS center number:

● Enter "Telephone", enter "*#5005*7672#", and touch the dial key to query the current SMS center number;

● If the SMS center number is abnormal or empty, please search the local SMS center number through the operator or search engine and enter "*#5005*7672* SMS center number #";

● SMS center numbers are different in different regions. Please check the number of the local SMS center before operation, and remember not to enter the local number. You need to enter "+86" before the number;

● After the input is completed, touch the dial key to set it.

How to delete the SMS center number?

Enter "Telephone", enter "##5005*7672#", and then touch the dial button to delete the current SMS center number.