Installation and Obtainium Guide

📦 Installation & Obtainium Update Guide

Secure Dialer is distributed directly as signed, open-source Android Application Packages (APKs). Because Secure Dialer does not connect to the internet, installing and updating via open-source tools like Obtainium or manual releases provides maximum privacy and control.

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🚀 Method 1: Automatic App Updates via Obtainium (Recommended)

Obtainium is an open-source Android app manager that allows you to install and automatically receive update notifications directly from GitHub Releases—without relying on Google Play Store or proprietary services.

Step-by-Step Obtainium Setup:

1. Download and install Obtainium on your Android device.
2. Open Obtainium and tap Add App.
3. Enter the official GitHub repository URL:

   https://github.com/Secure-Phone-apps/Secure-Dialer
   

4. Tap Add. Obtainium will analyze the release assets, select the optimal CPU architecture APK for your smartphone, and notify you automatically whenever a new version is released!

Tip

One-Click Add: If you are reading this page on your Android phone with Obtainium installed, simply tap the Get It On Obtainium button above!

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📱 Method 2: Manual Direct APK Download

You can download compiled and cryptographically signed APK files directly from our GitHub Releases Page.

CPU Architecture Selection Guide:

APK File Name	CPU Target	Applicable Device Examples
app-arm64-v8a-release.apk	64-bit ARM (arm64-v8a)	95% of modern smartphones (Google Pixel 6/7/8/9, Samsung Galaxy S20–S24, OnePlus, Xiaomi, Nothing Phone)
app-armeabi-v7a-release.apk	32-bit ARM (armeabi-v7a)	Older Android phones & entry-level budget devices
app-x86_64-release.apk	64-bit Intel/AMD (x86_64)	Android Studio Emulators, ChromeOS devices, & Android-x86 PCs
app-universal-release.apk	Universal Multi-Arch	Compatible with all Android devices (slightly larger file size)

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🔒 Method 3: Cryptographic SHA-256 Checksum Verification

To ensure your downloaded APK has not been modified or corrupted, verify its SHA-256 hash against the official published checksums.txt file attached to each GitHub Release.

Verification Commands:

• Linux / macOS Terminal:

  sha256sum app-arm64-v8a-release.apk

• Windows PowerShell:

  Get-FileHash .\app-arm64-v8a-release.apk -Algorithm SHA256

• Android Termux:

  sha256sum /sdcard/Download/app-arm64-v8a-release.apk

Compare the calculated 64-character hash string with the value in checksums.txt. The output must match identically.

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🛠️ Common Installation Troubleshooting

1. "App Not Installed" or "Package Conflict" Error

• Cause: Attempting to update or install over an existing app signed with a different key (e.g. debug build vs official release).
• Fix: Uninstall any existing or development version of Secure Dialer before installing the official release APK.

2. "Blocked by Play Protect" Warning

• Cause: Android Google Play Protect flags sideloaded APKs from open-source repositories when they aren't downloaded via the Google Play Store.
• Fix: Tap More Details -> Install Anyway. Secure Dialer contains zero malicious code or network callers.

3. "Unknown Apps Permission Denied"

• Cause: Android requires explicit user consent before a browser or file manager can install APKs.
• Fix: Go to System Settings -> Apps -> Special App Access -> Install Unknown Apps and toggle Allow for your browser or Obtainium.

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