What is Faraday Cage?
An enclosure made of conductive material that blocks electromagnetic fields, used in privacy to prevent wireless signals from reaching or leaving a device.
Also known as: Faraday Bag, RF Shield
A Faraday cage blocks all radio frequency signals — cellular, WiFi, Bluetooth, GPS, and NFC — from passing through.
Privacy Applications
- Phone pouches: Block your phone from connecting to cell towers or WiFi
- Laptop bags: Prevent wireless transmission during transport
- Key fob pouches: Block relay attacks on car keyless entry systems
- Server rooms: Shield equipment from electromagnetic eavesdropping
When to Use
- Crossing borders (prevent remote device access)
- Sensitive meetings (no phone surveillance)
- Transporting devices you don't want tracked
- Storing devices you want truly offline
Products
- Silent Pocket: Phone sleeves and bags
- Mission Darkness: Law enforcement grade bags
- DIY: Multiple layers of aluminum foil (less reliable)
Important
Your phone will appear to be "off" to the carrier when in a Faraday bag. Sudden disappearance and reappearance patterns could themselves be a signal. For best results, power off the device before placing it in the bag.
Related Terms
Burner Phone
A prepaid mobile phone intended for temporary use and easy disposal, typically purchased with cash to avoid identity linking. Used for privacy-sensitive communications where the phone and SIM can be discarded after use.
IMSI Catcher
A device that impersonates a cell tower to intercept mobile phone communications and track the location of nearby devices.
Location Services
A system that determines your device's location using GPS, WiFi, cell towers, and Bluetooth, often shared with apps and service providers.
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