In a few years mobile phones have changed our way of living and of communicating; a real instance of custom, an instrument of work and at the same time an extraordinary means to talk, to keep in touch, to send messages, to ask for help at the right moment. Nevertheless, just the widespread diffusion of mobile phones – that are probably the most widespread “domestic appliances” – shows that is very urgent to have a serious and radical limitation of the use of them in al lot of situations and a lot of contexts. Situations and contexts in which it is often not only a case of good manners (that would be in itself good enough a reason) that makes a telephone call inappropriate, but also the interference that such a telephone conversation causes to other electric sets. Preventing the use of mobile phones in certain places is therefore a widespread need, that we of INSHIELD can meet by giving a serious, reliable and guaranteed answer. In fact INSHIELD sets can shield limited areas from the use of mobile phones because they create a virtual shield within which no mobile phone can either receive or transmit. INSHIELD sets interact only on mobile phones, and they do not create any type of interference towards other radio systems or any other medical or electric hearing aid instrument. The electromagnetic field of INSHIELD is such as to satisfy the rules in force concerning electromagnetic pollution.