Replying to Calling all advanced android users

okay, so I made a thread here since I'm not an active member on any android boards

my problem is I need to permanently disable texting and phone calls on my spare S3 because I use it as a camera now and whenever friends break phones they always want to "just put my SIM in there and make a few calls real quick"
I managed to change the APN settings so it cant access the internet as well as find the root file to disable the WI-FI module but I cant find any answers for turning of texting and calling completely.

Phone is rooted so I'm looking to change some file extensions to .bak as I did for the wifi module.