Actually, people do worry about phones and remote microphone activation (see for example http://www.schneier.com/blog/archives/2006/12/remotely_eavesd_1.html ht

Actually, people do worry about phones and remote microphone activation (see for example http://www.schneier.com/blog/archives/2006/12/remotely_eavesd_1.html http://www.schneier.com/blog/archives/2006/12/remotely_eaves...). There are many places where you have to leave your cell phone by the door before entering.