Japanese engineers have designed wooden wall panels that can be used to block mobile phone signals. Suggested uses include movie theaters and restautants. I think this is a bad idea. I’ve only been bothered once or twice in my life by ringing cell phones in theaters. I always keep my cell phone on in movie theaters (using the silent, vibrate mode) in case I need to be contacted regarding any emergencies involving my family . Any theater or restaurant that uses cell phone blocking systems is opening themselves up to lawsuits. Link Discuss