Fights are going to break out over this: Hong Kong inventor Anil Vora is marketing a cheap and cheerless device that can jam mobile phone signals and disrupt calls. Vora came up with idea for the Mobile Squelcher (cost: £18) after becoming very irritated indeed by mobile phone users conducting private conversations in public. This guy needs to get out less. Somehow, we can't see too many Guardians of the Peace and Quiet putting their life in Mobile Squelcher's hands by using the gadget on, say, a packed commuter train. And while it may be legal to buy Mobile Squelcher, it is certainly illegal to use it -- in the UK, at any rate, where authorities discourage broadcasting on unauthorised airwaves through hefty fines. Finally, isn't there another Mobile Squelcher-type gadget already on the market. We recall stories about a similar device launched earlier this year in, we think, Israel. Unfortunately, our memory and search engine failed us. So if anyone can point us in the right direction email us here. ® Related story Man beaten to death for using mobile phone in pub