It's me again (agologies). I read in test 3 that it's possible to force the phone to close but haven't been able to figure out the code for that. I thought it would be just kps_close. So I come to you asking for the correct code.
Theres (currently) no function to do this. You can use the renpy function for closing a screen, the name of the screen the conversation happens in is called 'dynamic_scrollable_text', add '_group' if its a group chat, but this *may* cause issues. Ill add a function that does it next update :)