The "No Cell Phones" sign advises individuals and employees that the use of phones is prohibited in the given area. This can be used in the case where the use and presence of phones may cause a health and safety risk or where it is prohibited on the job.

The sign is best displayed at the entrance to the given workplace or area as to notify people to follow the rules as soon as they enter the given environment. It can also be displayed in areas where quiet is necessary such as libraries, religious buildings and highly regulated and monitored buildings.