Why can't I receive messages from my unlisted mobile phone?

There may be an error in the operation of the mobile phone system. You can format the phone refresh. If not, you can call the manufacturer's hotline or repair. Mobile phones need after-sales service. Your problem is within the scope of three-guarantee service (as long as it doesn't break for three years), but I suggest trying the first few samples first, because I am also engaged in digital product maintenance. If you take it to the factory for repair, I can guarantee that your mobile phone will not be used for a month (they will put some of your mobile phone).