The handset will feature a 3D camera and a screen that, to view the 3D images, does not need special glasses.
The handset will use technology similar to the Nintendo 3D. A special screen will transmit two differing images to the viewer and a different image must reach each eye to see the 3D effect.
LG's 3D TV range uses a polarised screen that requires special glasses.
LG claims the Optimus 3D will be "a complete platform for a one-of-a-kind experience on a mobile device," allowing content to be created and viewed, and then connected to full-screen devices.
LG's marketing chief Dermot Boden left the company in a "parting of the ways" on 1 January, having struck deals with the Formula 1 racing world.
This article was first published on marketingmagazine.co.uk.