Manufacturers have made several attempts at building a truly modular smartphone that can swap pieces in and out as technology and user habits evolve. In fact, you can buy a few of them right now, like the Moto Mods and, to a lesser extent, the Essential Phone with its swappable modules. Project Ara started as a Motorola project back in 2013 as part of the Advanced Technology and Products Group. The company touted the product as late as 2016, but eventually pulled the plug on releasing it as a consumer product. It's not out of the question, however, that we could see a similar tech show up as a licensed product or in some other piece of hardware.