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Welcome to the official technical documentation and wiki for Secure Dialer—a modern, zero-internet, privacy-first open-source Android calling application built with Jetpack Compose, Kotlin 2.0, and Room Database with SQLCipher encryption.
| Documentation Section | Description & Highlights |
|---|---|
| 📦 Installation and Obtainium Guide | Step-by-step setup with Obtainium auto-updates, CPU architecture APK selection, and SHA-256 verification. |
| ❓ FAQ and Troubleshooting | Dual-SIM routing, setting default dialer on Samsung/Pixel/Xiaomi, GrapheneOS/LineageOS compatibility, and backup/restore. |
| 🔑 Permissions and Privacy Explained | Transparent review of Android permissions, dynamic runtime requests, and strict exclusion of INTERNET. |
| 🛡️ Security and Encryption Architecture | AES-256 GCM database encryption, Android KeyStore, hardware TEE/StrongBox, and offline sandboxing. |
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🔒 Zero-Internet Security: Compiled without the
android.permission.INTERNETpermission. Your call history, contacts database, and dialing activity physically cannot leave your device. - ⚡ Lightning-Fast T9 Search: Dialpad search algorithm supports instant contact lookups by name, phone number, or initials.
- 🛡️ Local Encrypted Contacts Vault: Choose to store sensitive contacts in an isolated, SQLCipher-encrypted vault hidden from other apps.
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🚫 Offline Call Screening & Spam Rejection: Block nuisance calls and unwanted numbers using Android's native
CallScreeningServicewithout cloud tracking. - 📶 Dual-SIM Smart Selector: Full support for multi-SIM Android devices with automatic carrier preference memory and manual toggles.
- 🎨 Material You Dynamic Theming: Fluid Jetpack Compose Material Design 3 interface with true AMOLED dark theme support.
| Layer | Component / Framework |
|---|---|
| Language | Kotlin 2.0+ with Coroutines & StateFlow |
| UI Engine | Jetpack Compose (Material Design 3) |
| Database | Room Persistence Library + SQLCipher (AES-256 GCM) |
| Key Management | Android KeyStore System Provider (Hardware-backed TEE / StrongBox) |
| Telephony Integration | Android TelecomManager, InCallService, CallScreeningService |
| Target Platforms | Android 7.0+ (API 24 to 35+), GrapheneOS, CalyxOS, LineageOS |
- 🐙 GitHub Repository: Secure-Phone-apps/Secure-Dialer
- 💬 Community Discussions: GitHub Discussions
- 🐛 Report Issues: GitHub Issue Tracker
- 💖 Sponsor Project: GitHub Sponsors
📍 Quick Links: Installation and Obtainium Guide | FAQ and Troubleshooting | Permissions and Privacy Explained | Security and Encryption Architecture