Nubian calf z9mini sends text messages that others can't receive. What's going on here?

Hello, please check whether your mobile phone or the other party's mobile phone is down. It is recommended to pay in time. You can also try to send it to another number because there is a problem with this party. If Nubia has problems, it is recommended to restore the factory settings or upgrade to the latest system version and try again. If it still can't be solved, it is recommended to go to the nearest Nubian after-sales service center for debugging.