Step back, LG G5. There's a funky new modular smartphone on sale in Australia, and it's also -- in its standard, straight-out-of-the-box guise -- the world's thinnest. Motorola's Moto Z measures just 5.2mm from front to back, but still has the latest in high-tech hardware under the hood. Where LG's top Android phone ejects its modular components like a pistol's magazine, though, the Moto Z snaps them onto its rear case to add extra battery power, a high-res camera or a more powerful speaker.