What's wrong with setting the address of SMS service center to display no address on iPhone 6?

SMS center number setting method:

1, dial *5005*7672*+86 SMS center number # with iPhone.

2. Delete SMS center number: dial ##5005*7672#3 with iPhone.

3. Inquire about the set SMS center number: dial *#5005*7672# with iPhone.

Short message service center

It is a short message server. If it is not filled in correctly, the SMS cannot be sent successfully. Each region has its own information center number. Many mobile phones produced now do not need to be entered by themselves. If you are not clear, you can ask the local network operator, Mobile 10086, Unicom 100 10.

Basic format

For China Mobile, the number of SMS center starts with +86 1380, followed by four digits of the area code (telephone area code) where the number is located, such as 057 1 (Hangzhou), and finally it is generally 500. For areas with an area code less than four digits, the area code should be supplemented by 0 in the fourth digit, such as Beijing 0 100.