If two characters are having a phone call in my script, do I have to write CUT TO, and their locations over and over, everytime the camera cuts to the person talking?

I guess it depends if you want to show the person on the other end of the conversation, or if that person is a major character. I did that in my script that I'm writing right now. I'll show you later, lol.

I've read some scripts that say "The camera cuts back and forth between them as the conversation takes place" or something like that, and others that constantly write "CUT TO" and some that are all done with "VO" on one end. There are so many ways to do certain things in scriptwriting. Just convey the scene understandably and I don't think it will matter too much.

The proper way it to set up both ends of the phone call with their own scene slugs, and use a CUT TO to transition from the first to the second. Then write INTERCUT Cafe/Toothpaste Factory and continue from there.