iPhone 12 Pro
I can't send and receive picture messages
Solution 1 of 4: Your phone hasn't been correctly set up for picture messaging
A picture message is a message which can contain pictures and other media files and can be sent to other mobile phones. You can send and receive picture messages as soon as you've inserted your SIM. If this isn't the case, you can set up your phone for picture messaging manually.
Press Settings.
Press Apps.
Press Messages.
Press the indicator next to "MMS Messaging" to turn on the function.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.