The Sims 3 has already been released on PC, Mac, Xbox 360, PlayStation 3, Nintendo DS, Wii, Nintendo 3DS, iPhone, iPod Touch, Windows Phone.
You can already buy and download the game or pre-order it. Prices start from 1.24$. Check out the list of stores where you can buy The Sims 3 and compare prices.

All release dates for The Sims 3

USA:
  • PC → Game released → June 2, 2009
  • Mac → Game released → June 2, 2009
  • Xbox 360 → Game released → October 26, 2010
  • PlayStation 3 → Game released → October 26, 2010
  • Nintendo DS → Game released → October 26, 2010
  • Wii → Game released → November 16, 2010
  • Nintendo 3DS → Game released → March 22, 2011

The whole world:
  • iPhone → Game released → June 2, 2009
  • iPod Touch → Game released → June 2, 2009
  • Windows Phone → Game released → October 21, 2010

Europe:
  • PC → Game released → June 5, 2009
  • Mac → Game released → June 5, 2009
  • Xbox 360 → Game released → October 29, 2010
  • PlayStation 3 → Game released → October 29, 2010
  • Nintendo DS → Game released → October 29, 2010
  • Wii → Game released → November 12, 2010
  • Nintendo 3DS → Game released → March 25, 2011

Russia:
  • PC → Game released → June 5, 2009
  • Mac → Game released → June 5, 2009
  • Xbox 360 → Game released → November 5, 2010
  • PlayStation 3 → Game released → November 5, 2010

Japan:
  • Xbox 360 → Game released → November 18, 2010
  • PlayStation 3 → Game released → November 18, 2010

Explanation of statuses in release dates

Game in development

The game has been officially announced and is under development for the specified platforms. In this case, an exact or estimated release date is provided.

Game released

The game has been released, it is available for purchase or download on the specified platforms.

Not officially announced

The game has not been officially announced yet, but the likelihood of it is high. A possible release date and likely platforms are indicated.

Early Access

The game has been released in early access. This means that developers have released an unfinished, but playable version of the game, available to anyone interested. Usually, such versions are available at a reduced price or even for free, and the game is more expensive upon release. However, be prepared to encounter bugs, as development is still ongoing.

Beta testing

The game is being tested, it is available to everyone, or to a limited number of people. Tests can be closed or open. By participating in the beta test, players can try out the project shortly before its release.

Frozen

The game was in development for some time, but now it's frozen. Perhaps someday the developers will return and finish the game, but more often than not, the project is simply shut down.

Game canceled

The game's development has been definitively and irrevocably canceled. This status signifies the project's demise.

The project is closed

The game has faded into obscurity. What is currently happening with the project is unknown, but it is most likely shut down.