M2M Sentry - Signal Caller ID

Emem Umoh

About this app

Human or Machine? Know Instantly. M2M Sentry is a non-traditional Caller ID and diagnostic tool built to help you uncover the true nature of your incoming calls. Instead of relying on outdated directories or sticking generic "Spam" labels on unknown numbers, M2M Sentry analyzes live network signals to immediately show you the difference between a verified human, an automated service, or a potential spoofing attempt.

Built for 100% Privacy Your phone data belongs to you. That is why M2M Sentry operates entirely offline and processes all signal intelligence locally on your Android device. Your contacts, phone number, and call history are never uploaded to a remote server or shared with third parties.

Simple, Honest Pricing Security shouldn't require a monthly subscription. M2M Sentry is a powerful standalone utility available for a simple, one-time purchase. There are zero subscriptions, zero recurring fees, and absolutely no ads.

Optimized for North America M2M Sentry's diagnostic engine is heavily optimized for networks operating under the North American Numbering Plan (USA and Canada).

Please note: While the app is available globally, users in other regions may experience partial functionality. This is a factual limitation caused by varying international telecommunication laws and carrier regulations, which often restrict or hide the digital signaling data transmitted to devices outside of North America.

How It Works
• Technical Verification: Evaluates digital network signatures to identify genuine, verified human callers.
• Spoofing Detection: Detects mathematical patterns commonly used by scammers to manipulate local area codes.
• Automated Logic: Flags the high-speed, sequential dialing patterns typical of automated systems, call centers, and SIM farms.
• Visual Verdicts: Incoming calls are color-coded with a clear English explanation of exactly what our diagnostic engine found.

Core Features
• Forensic Call Log: A chronological list of your calls complete with the exact technical reasoning behind every verdict.
• Signal Glossary: A built-in, easy-to-read guide explaining exactly what each color and technical term means.
• Local Storage: Your logs are safely stored on your device and can be cleared instantly at any time.
• PDF Export: Generate clean, technical PDF reports of your call history for your own documentation.
• Lightweight Design: A clean, ad-free interface designed to be incredibly easy on your battery life.

DISCLAIMER: M2M Sentry is a diagnostic and advisory utility. While our analysis is based on technical network signals and carrier-level data, no automated software can guarantee 100% accuracy for every telephony event. The information provided is intended for security awareness purposes only. Users should always exercise their own caution and judgment before interacting with unknown callers or sharing sensitive information.

One-time purchase. No subscriptions. Privacy first.

What’s new

Minor text and formatting improvements for a clearer user experience.
Spelling and localisation corrections.
Under-the-hood preparation for a stable 1.14 release.