Post a Phone Concept by Priestman Goode
The "Post a Phone" from designer Priestman Goode is made to be mailed in a standard flat-pack A5 envelope, along with an ample spool of telephone cord. It's a cunning design, but what struck me most was his choice of materials: recycled cardboard and plastic. Now I imagine the phone itself is made of plastic, but why? Since the Post a Phone concept implicitly acknowledges the disposable nature of an occasional necessity, could it be possible to put the electronics in a more recyclable housing?
I'm just thinking out loud here. It very well may be more expensive from cradle-to-grave* to make cardboard a reasonable substitute for a single piece of plastic. It just seems like these are the sort of products where paper and cardboard would be great solutions.
Post A Phone by Priestman Goode [Dezeen via Core77]
* Or "cradle-to-cradle," as the case may be.

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From what I see the page you ;link to states: "Post A Phone is made from recyclable cardboard or plastic..." From how I read that, he is working on a possible way to make it entirely out of recyclable cardboard or out of a recyclable plastic (and I would hope recycled material to start with).
uh i see it in ultraviolet movie :P
Kind of clever. Of course, as an emergency or back up phone it does sort of lose something as copper pairs with central office backup power are being taken out by companies like Verizon that replace them with FO which doesn't work without local power...
Also, doesn't look like anyone should even think about trying and getting that thing back into the original package--you'll never get the wire coiled that nicely again...