What number does Unicom send? It is set to be turned off, but it can be reminded by SMS.

When the other party's mobile phone receives it, your mobile phone will prompt the other party to receive it.

But the hint is that your own system is easy to use, that is, Unicom is connected to Unicom, and mobile is correct.

If the mobile sends a short message to Unicom, the instant prompt is successful, and the other party may not be able to send it to the mobile gateway.

So if you want to see whether the mobile phone is turned on or received, you can only send it to the mobile phone with your mobile phone, which is accurate.