It's a big day for Verizon, as the wireless carrier will see the launch of not one, but four new smartphones today, Engadget reports.

Verizon will release three handsets running Google's Android mobile operating system and one based on Microsoft's Windows Phone 7. The three Android phones include the Motorola Droid X, the LG Revolution and the Sony Ericsson Xperia Play. The Windows device is the HTC Trophy.

Perhaps the biggest name on the list is the Xperia Play, often referred to as the PlayStation Phone. Based on Android 2.3, or Gingerbread, the smartphone doubles as a hand-held gaming console, similar to Sony's PSP. The phone is shipping with six games already loaded, and more titles can be accessed through the V Cast app.

The other notable gadget in Big Red's lineup is the HTC Trophy – the first WP7-powered smartphone from the wireless carrier. This device also boasts a heavy gaming angle via a direct sync to Microsoft's Xbox Live.

Both Android and Windows Phone are expected to make big waves in the smartphone OS market going forward. According to a recent IDC study, Android and Windows will represent the top two mobile operating systems by 2015, respectively.