On Thu, 18 Apr 2013 00:01:27 -0500, wrote:

Speculation is that the bombs were set off by cell phone. I wonder if
a cell signal would penetrate the metal of a pressure cooker. Mine
barely works in my metal shop building; with the doors open. Any
experts want to weigh in?

one could simply run a small insulated wire through a matching hole in
the body of the pot for an antenna. Its not rocket science and a
small hole wouldnt effect the pressure build up significantly.