Easy way to add in-game cheats?

Just wanting some help with the in-game phone number cheats.
Is there an easy way of putting all the built-in cheats in, or do I have to do them one by one?
Playing the steam version.
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Thank you for that information. Hopefully I can just install that part of it.
Have you figured it out? if you have a save GoTR won't work on vanilla saves, Overhauled Stillwater can and I think has that 1337 cheat as well, hope that helps.