Digital Trends – Launched earlier this week and announced on the Steam site, Valve has started a closed beta for Steam Mobile on the iPhone and Android phones. The mobile application brings a vast amount of core functions found within the PC and Mac version of the Steam software, the most notable being the ability to make purchases through the application. This will allow any mobile Steam user to take advantage of the frequent sales that cut popular games up to 90 percent off. Assuming the user agrees to notifications from the application, Steam will also be able to feed mobile alerts to the user when a game on a user’s wishlist goes on sale. The interface offers the familiar Steam categories of new, featured, popular and specials. In addition, there’s a search interface allowing the user to find games by price, title or genre.