What if the text message can't be sent out?

I use mobile, and I met the same situation as the landlord last year. Then my friend who came to the mobile company solved it.

The solution is as follows:

Information-Options-Settings-SMS-Message Center -SIM Card Message Center-Message Center Number

After finding the information center number, check whether the center number is wrong.

For mobile users, the correct center number is+861380xxxxx500, where xxxx is your local fixed telephone area code. For example, the area code of Changsha is 073 1, and the number of Changsha Mobile Communication Information Center is +86 1380073 1500.

Unicom's information center number is temporarily unknown.

It should solve this problem.