How do I set up a situation where calls cannot come in, but messages can be displayed?

This is achievable. Set up your phone to forward calls to an out-of-service number. In this way, others will not be able to make incoming calls, but your mobile phone can receive text messages normally. You can also turn on the incoming call text message reminder service and then turn off the phone.

The incoming call SMS reminder service is a value-added service launched by the operator. When the user shuts down the phone or sets do not disturb, the incoming call information will be sent to the user in the form of SMS when the user turns on the phone to remind the user that Which numbers and at which times the calls were made.

Related information:

Customers cannot use incoming call reminders when setting up call forwarding. Customers can use incoming call reminders after canceling the call forwarding setting.

After turning on the incoming call reminder, when the phone is turned off or out of the service area, a friend will hear the prompt when calling the mobile phone: "Hello, the user you are calling has enabled the incoming call reminder function. We will use your call information as Notify the other party via text message, "Thank you for calling, please hang up and say goodbye." You do not need to pay for this call. Text messages recording incoming call information are retained in the system for 24 hours.