Clear signs informing the public that mobile phones must be switched off at the site. The signs are well suited for a variety of environments where mobile phones are perceived as disruptive, such as hospitals, quiet zones and cinemas. They are also suitable for use in places where mobile phones can pose a safety risk, such as petrol stations.

The sign meets the requirements of the European standard EN ISO 7010. The standard determines the design and colour of safety signs in workplaces and in other locations where people need safety information. The aim is for the safety signs to be easy for anyone to recognise and understand regardless of where they are and which language they speak.