Tower Dump
Definition
A legal demand directed to a mobile network operator for records of all devices that registered with one or more specific cell towers during a defined time window. Used to identify which phones were near a crime scene. Returns a large dataset requiring filtering to isolate devices of interest.
- Nature
- Legal demand for records from a cell tower
- Scope
- All devices registered during a defined time window
- Purpose
- Identify devices near a crime scene
- Output
- Large dataset requiring filtering
Common questions
Why does a tower dump return so many records that need filtering?+
A cell tower serves every device in its coverage area during the requested window, not just devices connected to a suspect, so the initial return can include thousands of unrelated subscribers, and investigators must cross-reference times, locations, or known numbers to isolate devices of interest.
What legal considerations apply to obtaining a tower dump?+
Because a tower dump captures data on many uninvolved third parties, courts in several jurisdictions require a heightened showing, such as a warrant supported by particularised justification, rather than treating it as a routine records request, reflecting privacy concerns beyond a single-subscriber records request.
How is a tower dump different from tracking one specific phone's location history?+
A tower dump starts from the tower and returns every device present, useful when investigators do not yet know a suspect's identity, while single-device location history starts from a known phone number or device identifier and traces that one device's movement over time.
Related terms
- Cell Site Location Information (CSLI)
- Records held by a mobile network operator showing which cell towers a device registered with and when. Historical CSLI covers past registrations....
- Geofencing Artifact
- A record generated when a device enters or exits a defined geographic boundary. Fitness apps, delivery apps, and smart-home apps create these...
- GNSS (Global Navigation Satellite System)
- The family of satellite-based positioning systems including US GPS, Russian GLONASS, European Galileo, and Chinese BeiDou. Mobile chipsets typically support multiple constellations...
- Significant Locations
- An iOS feature that records frequently visited places using a combination of GPS, Wi-Fi, and cell data. Stored in an encrypted SQLite...
- Wi-Fi Probe Request
- A broadcast management frame that a Wi-Fi radio sends when scanning for known networks. The frame advertises the SSIDs stored in the...