Associated Press

The number of active smartphone users topped 1 billion in 2012, with analysts estimating that Android and Apple iOs combined account for the majority of these smartphones. Another billion people are expected to join the world of smartphone users by 2015.

Here's a look at the top 10 free iPhone apps for June 4, 2013.

10 Fast & Furious 6: The Game

The Fast and Furious app, based on the latest "Fast and Furious" movie, lets players race around the streets of London, joining in heists, battling with "lethally skilled mercenary drivers" and competing in tournaments.

9 Crazy Dentist

Labeled as a children's game, users are challenged to come and find out how crazy the dentist at the dentist's office really is.

8 Snapchat

Snapchat is chatting for a faster world, where users take photos, record videos, add text and drawings and send them to contacts while deciding how long the recipient is given to view the photo.

7 Tetris Blitz

Tetris Blitz invites users to play the well-known game, but with a twist where players are given two minutes to clear as many lines as possible.

6 Turbo Racing League

The Turbo Racing League app, which ties into the upcoming DreamWorks movie, "Turbo," lets users race snails around the screen while competing for real-world cash prizes totaling $1 million.

5 Snoopy Coaster

Snoopy, Charlie Brown, Linus, Lucy and Peppermint Patty star in this game where Snoopy takes the gang on a roller coaster ride, collecting things like coins, balloons and kites along the way.

4 Vine

Vine is a video sharing service that allows users to create and share short looping videos on Twitter and phones. The app touts itself as the "best way to see and share life in motion."

3 Candy Crush Saga

Candy Crush Saga is a match puzzle game that invites users to "switch and match" their way through more than 100 levels.

2 Hi Guess the Brand

The Hi Guess the Brand app challenges users to identify the brand depicted in a puzzle.

1 Dumb Ways to Die

The Dumb Ways to Die app comes from the public service announcement campaign by Metro Trains in Melbourne, Australia, which was meant to encourage people not to do dumb things around trains. The video and song tied to the campaign went viral in 2012, and Metro released the app in May 2013.