The cell phone detector can detect any cellular phone. It covers and protects a large area from perpetrators carrying a cellular phone, even directly under high voltage restricted areas. This is ideal for human presence detection from 2 m up to 1,5 km (a large terrain).A perpetrator simply has to carry a cellular phone with him. Portable devices can also assist security personnel to locate hiding thieves. It is the lowest cost alternative to ground radar systems. Perpetrators’ cellular phones make them detectable and distinguishable from other large animals.