Mobile software is a large and growing industry. The mobile industry now includes over 3.3 billion users worldwide, representing half of the world's population. It is also growing rapidly, adding 3 new users per second. In 2007, the SMS revenue from the mobile industry was $100 billion, exceeding the combined revenue of movie box offices, DVD sales, the music industry, and video games. Mobile allows users to access the internet and applications from anywhere via wireless transmission over radio waves.