Apple X sends photos by SMS, but it can't be sent. What should I do?

Because the "send and receive MMS" function is not turned on, just turn it on in the settings.

Materials/Tools: Take iPhone8 as an example.

The specific operation includes the following steps:

First, open "Settings" on the phone desktop.

2. Open "Settings", find the "Information" column, and click to enter the next step.

3. Click the button on the right side of "Send and Receive MMS" in the "Information" page to open this function.

Fourth, you can send photos after opening the "send and receive MMS" function.