Mobile phones are widely used in the world. While people have to be connected to one another, there are situations or places where their usage is to be prohibited either due to security reasons or it may cause health hazards. Mobile phone detection has been on investigation for a long time and there are techniques that have been formulated or proposed on how mobile phones can be detected. Most techniques use features like audio systems, RF systems, and common materials of the phone and try to look into how they can be used as a basis to detect mobile phones. This project utilizes the RF system of the mobile phone as the feature to be used to detect their presence. A circuit that detects signals of the range 0.9GHz to 3GHz is used to detect a mobile phone when in use. When the signal is detected, an LED blinks to indicate the usage of a mobile phone within a radius of 1.5 meters.

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