Release date is unrevealed yet, but it has already been soft-launched only in Brazil.
Since the game is currently only available in Brazil, some players from other locations use APK to play. For how to play the game on your Android phone instantly, check the link below.
Sims Mobile is the newest Sims game officially announced by EA in May. This mobile game is currently only available in Brazil as soft launch, and exact worldwide release date isn't revealed.
Sims Mobile is not the first Sims game on your smartphone. Sims Freeplay is the first one and it was launched in 2011 ~ 2012. EA Mobile and Firemonkeys Studios developed the game. It's still available on App Store and Google Play Store.
How to update The Sims Mobile APK
The Sims Mobile House Idea forum
The Sims Mobile Daily Wishes