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