Mobile phone jammer units are small electronic devices that block all incoming and outgoing cell calls in an area. They interfere with specific carrier frequencies to completely disrupt and prevent phone communications. This suppresses cell phones to dissuade microwave hazards that can cause electronic interferences in critical areas and inappropriate voice interruptions. Such devices are restricted by laws in the United States and many other countries. Factors to consider when choosing mobile phone jammer products include their performance specifications, construction, and antenna directionality.

When cell phones became commonplace, people began looking for ways to better manage unwanted signals. Phones risked disturbing equipment and people in hospitals, schools, theaters, and elsewhere. Widespread use made these disruptions more common. To avoid problems in vital areas, organizations, businesses, and individuals began using 3G mobile phone jammer technology. This allowed them to completely block these calls, which might otherwise happen unexpectedly.