A curious shift is taking place in the world of mobile phones. For more than a decade, the trend was to make mobile devices smaller and sleeker. Now, all of a sudden, the opposite seems to be happening.

After Samsung released its own 4.5-inch Infuse 4G on AT&T, HTC appears to be following in suit.

According to hardware specs recently leaked by 911sniper and reported by Phone Arena, HTC is working on a new 4.5-inch smartphone of its own for HTC. The device, internally dubbed the HTC Holiday, boasts a qHD resolution with 540 by 960 pixels, according to the leaked information.

Under the hood, the smartphone features one gigabyte of RAM, a 1.2-gigahertz dual-core processor from Qualcomm and the latest version of Google's Android mobile operating system – Gingerbread. The Holiday will also include an 8-megapixel rear-facing camera and a 1.3MP front-facing camera.

Neither HTC nor AT&T have confirmed the rumors or a release date. However, given the name, one might expect the phone to hit shelves toward the end of the year.

Android-based handsets have become a good business for HTC in recent years, as the mobile OS continues to surge. According to recent iSuppli figures, HTC's market share grew 6.2 percent year-over-year in the first quarter of 2011.