CellGuard

Your phone. Your privacy. Real-time defense against cellular surveillance. CellGuard is an anti-surveillance security app for Android that detects IMSI catchers (fake cell towers / Stingrays), app-based snooping, and stalkerware in real time. All analysis runs on-device — nothing is transmitted, collected, or shared. ━━━━━━━━━━━━━━━━━━━━━ WHAT CELLGUARD DETECTS ━━━━━━━━━━━━━━━━━━━━━ 🛰️ Cellular Surveillance • IMSI catchers and fake base stations • Network downgrades (LTE → GSM, classic stingray technique) • Zero neighboring cells (fake tower signature) • Abnormally strong GSM signals • Rapid cell tower handoffs • Location Area Code changes without movement 📱 App-Based Snooping • Apps actively using your microphone, camera, or location • Stalkerware detection via dangerous permission combinations • Apps with accessibility services reading your screen • Unknown device administrators • Notification listeners intercepting your messages • Sideloaded apps holding sensitive permissions 🌐 Network Threats • Active VPN profiles intercepting traffic • Suspicious certificates and potential MITM ━━━━━━━━━━━━━━━━━━━━━ HOW IT WORKS ━━━━━━━━━━━━━━━━━━━━━ CellGuard runs continuous cellular detection heuristics alongside real-time AppOps monitoring. When a threat is detected, you get an instant notification with severity level and technical detail. THREAT LEVELS 🟢 SECURE — No anomalies detected 🟡 LOW — Minor indicator, likely benign 🟠 ELEVATED — Multiple indicators, vigilance warranted 🔴 HIGH — Strong evidence of surveillance 🚨 CRITICAL — Active protocol-level attack confirmed (root mode) ━━━━━━━━━━━━━━━━━━━━━ ROOT-ENHANCED MODE (OPTIONAL) ━━━━━━━━━━━━━━━━━━━━━ Rooted Qualcomm devices unlock protocol-level detection through the DIAG interface: • GSM A5/0 (no encryption) detection • LTE Authentication Reject identification • Null integrity (EIA0/EEA0) detection • IMSI Identity Request alerts • /proc/fd hardware-bypass scanning Standard (unrooted) devices still get full cellular heuristics, sensor monitoring, and push notifications — root only unlocks deeper analysis. ━━━━━━━━━━━━━━━━━━━━━ PRIVACY BY DESIGN ━━━━━━━━━━━━━━━━━━━━━ CellGuard does NOT: ✗ Collect personal data ✗ Transmit information off your device ✗ Use analytics, ads, or trackers ✗ Require account registration ✗ Need internet access for detection Every calculation is local. The only off-device connection is the Play Store update check. ━━━━━━━━━━━━━━━━━━━━━ LANGUAGES ━━━━━━━━━━━━━━━━━━━━━ English, Spanish, French, German, Portuguese, Arabic, Chinese, Japanese, Russian ━━━━━━━━━━━━━━━━━━━━━ KNOWN LIMITATIONS (we believe in honesty) ━━━━━━━━━━━━━━━━━━━━━ • Passive IMSI catchers (listen-only) cannot be detected by any software method — physical SDR hardware is required • Cell heuristics can trigger false positives in rural areas, buildings, or during carrier maintenance • Encryption verification requires root + Qualcomm chipset • MediaTek and Exynos chipsets do not support DIAG protocol-level detection • CellGuard is a detection tool, not a blocker — it alerts you to threats; it cannot prevent them from occurring ━━━━━━━━━━━━━━━━━━━━━ WHO THIS IS FOR ━━━━━━━━━━━━━━━━━━━━━ • Journalists and activists concerned about targeted surveillance • Privacy-focused users • Domestic abuse survivors worried about tracking apps • Security researchers • Anyone who values phone privacy ━━━━━━━━━━━━━━━━━━━━━ Built by BlackFox Media LLC. © 2026. All rights reserved. Questions or support: [email protected]