They speak Simoleon. It was first used in The Sims 1. Mabye you missed it while first playing the Game. I Only play The Sims 1 but im pretty sure they mentioned it in the second one.
Chat with our AI personalities
You can choose the language that text will appear in, but the people will still speak "Similish".
You can not change the language.
no there's not, sorry
Simlish, a language made for the sims and the sims alone no one can find out what their saying. Not really gibberish but its a scrambling of each and every language in the world.
Sims do not speak English to give the player the feel of them living in a different world. Also this makes it easily switched to multiple languages.