A mobile jammer for home use is a device designed to block cellular signals within a residential area, preventing mobile phones from connecting to the network This can be useful for reducing calls and interference , to increase privacy, or reduce electronic interference. These jammers cause signal interference which prevents communication between phones and cell towers. However, there are legal restrictions on their use in many areas due to potential interference with emergency services and other communication devices. Homeowners should check local codes before using mobile jammers to avoid legal problems.