Project Ara perhaps embodied the ideal of a truly modular smartphone, but now that it’s dead, the interpretation of what “modular” means is fair game. For LG, it means removing the bottom edge to plug in accessories. For Motorola, it’s simply magnetically attaching a back cover. For the makers of Fairphone, however, it simply means being able to easily replace components when they’re broken. Originally launched last year, the “easy to repair” Fairphone 2 is now getting a refresh with its first customizable part: a back cover.