Source. Patent application. Huh So either you'll be lugging around a phone and five modules, or limit yourself to one preferred module (which beats the point of having a modular phone), or keeping modules in places where you'll be likely to use them and only carrying the phone around... this could be good, but it could also be very bad. I like the idea of a modular phone, if the modules can be used all at once. And apparently these can. Only in my mind the modules stack up into a single device, instead of juggling five-six devices at once. Oh I dunno, we'll see. Maybe the phone is actually being developed by someone else and Microsoft is just patent trolling.