Paint blocks mobiel phone signal

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The ubiquitous presence of the mobile phone can be a nuisance during class, meetings, concerts, the movies, etc. USA company NaturalNano claims to refine and market a radio-frequency shielding paint that can block signals in spaces treated with the paint. It ca also be used to create private networks inside spaces. The technology works at the nano-level, of which I cannot say anything informed, but apparently leaves open some sort of selective access control, which means that some signals can be allowed through while others are being shielded. Legal problems may arise, as blocking radio frequency signals is illegal in some/most countries. I wonder whether this technological fix is more useful than social mechanisms for preventing unwanted phone calls?

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