Phone-Side Stingray Sentinel
A privacy app that runs in the background on your phone and watches for the radio fingerprints of cell-site simulators (IMSI catchers) — alerting you when your signal shows signs of being intercepted while warning you what that means.
Privacy-conscious smartphone users, especially journalists, activists, and people attending protests
- Background signal analyzer that flags suspicious 2G downgrades, sudden tower changes, and known IMSI-catcher fingerprints
- Plain-language explanation of what was detected and what was likely captured (location, IMSI, SMS)
- One-tap scrub and lockdown mode that turns the phone into airplane mode until you're out of the suspected zone
- Optional anonymous crowd-reporting so other users in the area see a live heatmap
FalcoNet and similar systems are now being mounted on Chevy Tahoes and flown on helicopters across multiple U.S. states — the threat has moved from rare to routine.
EFF documents Jacobs CSS deployed in 35+ state/local U.S. police departments with 300+ global deployments and 5G capability, yet existing detection apps (AIMSICD, SnoopSnitch, CellGuard) remain niche open-source projects with limited consumer awareness — real concern exists but mainstream demand is modest.The Next Generation of Cell-Site Simulators is Here. Here's What We Know ↗Detecting IMSI Catchers: Tools, Apps and Methods ↗
Crowded field of established free/open-source detection apps — AIMSICD, SnoopSnitch (srclabs), CellGuard (SFU), Network Survey, plus carrier-side AntiSpy from Croatian Telecom — leaves limited room for a new consumer-facing entrant without clear differentiation.SnoopSnitch - Apps on Google Play ↗Android IMSI-Catcher Detector Alternatives ↗
All major incumbents are free/open-source, and the target audience (journalists, activists, protesters) has low willingness to pay and expects privacy tools to be free — paid monetization will be very difficult.SnoopSnitch - Apps on Google Play ↗Android IMSI-Catcher Detector by CellularPrivacy ↗
Threat is accelerating: Jacobs 300+ global CSS deployments, 5G-capable systems, integration into Tahoes/Silverados, active competitors (Cognyte, Tactical Support Equipment) — the surveillance problem is growing, not fading.The Next Generation of Cell-Site Simulators is Here. Here's What We Know ↗Texas DPS surveillance technology purchase raises privacy, oversight questions ↗
Building a reliable, always-on background detector is hard: requires low-level radio/firmware access, often needs root on Android, iOS is essentially closed to this class of app, and battery drain from continuous radio monitoring is significant — explains why mature incumbents took years and remain niche.SnoopSnitch - Apps on Google Play ↗Android IMSI-Catcher Detector by CellularPrivacy ↗