Considering how large current smartphones can be, the normal placement of Android button below the display may no longer be considered as appropriate. Some argue that the button should be placed on the sides, but this could pose problems for left-handed people and on ultra-slim devices.

A new sketch of the LG Optimus G2 reveals a rather innovative concept of placing buttons on the back. The Optimus G Pro has included a programmable key, which can be tied to any app, so it won’t be to surprising to see if the feature is developed even further.

LG may need to do this because the Optimus G2 will be very thin and it won’t be able to accommodate physical buttons on the sides. If this rumor holds water, the Optimus G2 could become a rather intriguing smartphone with unusual design.

As a high-end device, the phone will be equipped with 5” full HD display, Qualcomm Snapdragon 800 quad-core processor, 2Mp front-facing camera, 13Mp rear-facing camera and Jelly Bean (Android 4.2) OS. LG’s mobile department chief said that the phone will be launched in the third quarter, but the company has yet to announce this officially.