Motorola stunned us a few months ago when it announced plans to develop a modular smartphone through a collaboration called Project Ara, but we’ve yet to see even a prototype of the device. Here at CES, ZTE is showing off its own modular phone concept, named the Eco-Mobius. The model on display is locked behind glass, and try as we did representatives would not remove it from its tomb for a close look. But the concept does show how users could replace the camera, battery, display, and “core” modules. The core includes separate modules for the processor, RAM, storage, and graphics processor.