LG did not say what kind of OS the phone uses, and could not immediately be reached for comment.

The South Korean electronics giant also plans to show off two additional smartphones at the Mobile World Congress, the Optimus 2X and Optimus Black, details of which have previously been announced. The Optimus 2X has a dual-core Nvidia Tegra 2 processor on board for powerful multimedia, including smooth web browsing and 1080p HD video playback, LG said. The Optimus Black is a thin, light Android smartphone with a 4-inch display designed to be read under any lighting situations.

LG said 2 million pre-orders have already been placed for the Optimus Black since it was unveiled at the International Consumer Electronics Show in Las Vegas in January.

LG's mobile phone operations struggled last year due to a focus on emerging markets. The company caught onto the rise of smartphones late compared to rivals, but has worked hard to make a comeback.

The Mobile World Congress opens on Monday in Barcelona.