Secure Dialer

byChar0n · Tools

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7.0

android

AI summary

Open-source offline dialer with encrypted local notes and backups, dual-SIM calling, contact tools, spam blocking, and caller ID controls. The latest update adds WhatsApp account integration and outgoing caller ID masking.

Generated by AI. May contain inaccuracies.

About this app

An open-source, privacy-first Android phone app built from scratch around one promise: zero internet permission, zero ads, zero trackers, and complete on-device privacy.

Features

Dialpad and outgoing calls

- Fast T9 predictive search from the dialpad by spelling names or dialing numbers. - Tactile haptic feedback and classic DTMF tones. - Smart clipboard paste that strips dashes, spaces, and formatting brackets. - Quick speed dial: long-press keys 1 to 9 to call favourites or emergency numbers. - Full dual-SIM support with a multi-SIM prompt on outgoing calls and customizable default SIM per contact or carrier.

Privacy and hardware security

- Zero internet access: the app does not declare android.permission.INTERNET, so it is physically impossible to send your data anywhere. - Custom call notes, speed dials, and blacklists stored locally with AES-256 SQLCipher encryption. - Encryption keys sealed inside the device hardware enclave (TEE or StrongBox) via Android KeyStore. - Encrypted backups with PBKDF2 and AES-GCM.

Everyday utilities

- Fake Call Simulator: trigger a realistic, customisable incoming call screen with a timer for politely excusing yourself. - In-call notes and a local recorder saved encrypted on device. - Motion gestures: flip face-down to silence incoming rings, or raise-to-ear to answer automatically. - Call back reminders scheduled as local alarms. - Visual call summary with offline statistics and charts.

Spam blocking and contacts

- Native call screening using Android's CallScreeningService, blocking unwanted callers, robocalls, and hidden numbers offline in under 5 milliseconds. - vCard and VCF backup and restore, completely offline. - Duplicate contact cleaner to find and merge repeating numbers.

Permissions

Secure Dialer requests only the standard telephony permissions required to be a default phone app. Since the app has no internet permission, all data stays on your device. This includes contacts read and write, call placement, call log read and write, audio routing, full-screen intent for incoming calls, notifications, SMS for quick replies, phone state for dual-SIM detection, and vibration for haptics.

License

GNU General Public License v3.0

phone dialer privacy open source call screening offline

What's new

v1.8.0Nov 4, 2026

WhatsApp Multi-Account & Contacts Integration
Contacts Screen WhatsApp Actions: Integrated WhatsApp messaging shortcuts on expanded contact cards and beside individual phone number rows. Intelligent Package Auto-Detection: Auto-detects whether standard WhatsApp (com.whatsapp), WhatsApp Business (com.whatsapp.w4b), or both are installed on device, launching single installations instantly without unnecessary prompt dialogs. In-App Account Chooser: Displays a dedicated Material 3 choice dialog with optional "Remember choice" preferences when both WhatsApp Personal and Business apps are present. Default WhatsApp Account Settings: Reconfigurable Default WhatsApp Account control added to Settings > Advanced Tools (Always Ask, WhatsApp, Business). 10-Language Parity & Package Visibility: Full localized translation parity across all 10 supported languages and AndroidManifest <queries> declarations for Android 11+ package visibility. Outgoing Caller ID (CLIR) Privacy
Outgoing Number Masking (CLIR): Added a master toggle to withhold Caller ID on outgoing calls so recipients see Private/Unknown number. Carrier Standards & Custom Prefix: Built-in support for global carrier prefixes including #31# (GSM standard), *67 (US & Canada), 141 (UK), 1831 (Japan), and full custom prefix input. Hardware SIM Settings Direct Shortcut: Added a direct launcher button to open Android's native SIM Calling Accounts screen for hardware-level carrier caller ID configuration. Emergency Number Safety Guarantee: Automated bypass protocol ensures emergency service calls (911, 112, 999, etc.) are never prepended with carrier codes and always broadcast subscriber telemetry to first responders.
Settings, Features & UI Improvements
Improved Settings & UI Appearance: Refined settings navigation, visual hierarchy, and Material 3 design layout for a cleaner, modern look. Contact Source Selection: Added full support for selecting and managing contact sources (Device Contacts, Custom Secure Contacts, or both). Enhanced Existing Features & Security: Upgraded core call handling mechanisms, data encryption controls, and local privacy safeguards. Expanded Feature Controls: Introduced granular configuration toggles and enhanced controls across application preferences and call management features.