Secure Dialer

byPsychopath · Tools

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5.0

1 review

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7.0

android

AI summary

An open-source, privacy-focused dialer with zero internet permissions, ensuring all call logs and contacts stay offline. Features include T9 search, call recording, spam blocking, dual-SIM support, and encrypted local backups. The latest update adds outgoing caller ID privacy and improved call recording reliability.

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

tools dialer open source privacy offline call recorder

What's new

v1.6.0Sep 28, 2026

Outgoing Caller ID Privacy
Added a master toggle to withhold Caller ID on outgoing calls, so recipients see a Private or Unknown number. - Built-in support for global carrier prefixes, including #31#, *67, 141, and 1831, with full custom prefix input. - Added a direct shortcut to Android's native SIM Calling Accounts screen for hardware-level caller ID configuration. - Emergency numbers (911, 112, 999, and others) are never prepended with carrier codes.
Call Recording Reliability
Recordings are now always saved, even after rapid call teardown. - Added graceful buffer flushing before storage cleanup to prevent truncated or ghost recordings. - Opening Call Recordings settings now automatically recovers and indexes orphaned recordings. - Added a proper microphone permission flow with clear prompts.