I don't understand how to load it into Ren'py to format it. How do you use it???
copy the aPhone and the bPhone .rpy files over to your game directory.
look through the script.rpy provided in the download for how to use it. The aPhone.rpy is the main script for the phone (i don't recommend changing anything there) the bPhone.rpy is for defining the images to show them in the phone and full screen (you will need to modify this for your image files). I have a discord channel for this phone if you need more help.