How can I send a text message to the other party when Apple's mobile phone doesn't display the phone number?

First, turn on the airplane mode, then turn on Wi-Fi, connect to the network, register a new Apple ID with your email, log in to iMessage through this Apple ID and activate it, open the SMS application, and enter the other party's mobile phone number. If iMessage appears in the background of the input box, it means that it can be sent successfully!

If the other party is not iPhone:

Ask someone inside the operator to open the hidden number for you. No matter whether you send a text message or make a phone call, the other party will display an "unknown number", which is the right of salespeople in general business halls. Some provinces and cities can spend money to open, but few!