No Network, Julian Oliver
From the artist’s website:
Mobile network jammer, in the form of a battle tank. 2013
With the flick of a switch No Network implements a blanket ban of mobile telephony in its presence. All access to the cellular (mobile) network within a 6-15m diameter aura around the device is jammed, including calls, SMS and data connectivity.
Hell yeah. For more info (and a disclaimer), head to julianoliver.com