User Manual

SecureCall user manual — installation, contacts, calls, settings, security, and troubleshooting · Last updated April 1, 2026

Installation & Setup

Get SecureCall running on your device in under two minutes.

• Install from Play Store Beta — join the beta program on Google Play, or download the APK directly from GitHub.
• Complete onboarding — swipe through the 4 onboarding screens to learn the basics.
• Enter your phone number — when prompted, enter your phone number to create your SecureCall ID.
• Grant permissions — allow Microphone (required for calls) and Notifications (required for incoming call alerts).

Managing Contacts

SecureCall uses its own contact list — separate from your phone contacts — to protect your privacy.

• Add contact manually — go to the Contacts tab, search by phone number, and add the contact.
• Add via Invite Link — share your personal invite link: stealthx.tech/invite/YOUR-ID. Recipients tap the link to add you automatically.
• Add via QR Code — go to Contacts → Invite → Show QR Code. The other person scans it with their SecureCall app.
• Verify contact — long-press a contact → “Verify Contact”. Verified contacts display a ✓ badge confirming their identity.
• Block contact — long-press a contact → “Block Contact”. Blocked contacts cannot call you.
• Delete contact — long-press a contact → “Delete Contact”. This removes the contact from your list permanently.

Voice Calls

All calls are encrypted end-to-end. No one — not even SecureCall — can listen to your conversations.

• Outgoing call — open the Dialer tab, enter the phone number or select a contact, and tap the Call button.
• Incoming call — when a call arrives, tap Accept to answer or Decline to reject.
• During a call — use the on-screen buttons: Mute (toggle microphone), Speaker (toggle loudspeaker), and End Call (hang up).
• No audio? — check your volume level, disable any active VPN, and try switching from Mobile Data to WiFi (or vice versa).

App Settings

Configure SecureCall to match your security needs and preferences.

• Account — view your current tier (Free / Pro / Premium) and upgrade using an activation code.
• Security — certificate pinning and device attestation status (read-only, always enabled).
• Anti-Recording — screenshot blocking, exclusive microphone access, and recording detection. Protects against screen recording and spy apps.
• Calls — background service toggle (keeps app alive for incoming calls) and call history on/off.
• Appearance — switch between Dark, Light, or System theme mode.
• Network — view active network information and set your preferred network type.
• VPN — configure WireGuard VPN for encrypted network tunneling (Premium tier only).
• Diagnostics — enable SecLog diagnostic logging, export logs as CSV, or clear all logs (Pro and Premium tiers).
• Emergency Delete — tap the Emergency Delete button 5 times rapidly to wipe all SecureCall data from your device instantly.

Security Features

SecureCall is built with a zero-trust security model. Every layer is designed to protect your privacy.

• End-to-end encryption — all calls are encrypted with XChaCha20-Poly1305, a military-grade authenticated cipher.
• X25519 key exchange — new encryption keys are generated for every single call. Previous calls cannot be decrypted even if a key is compromised.
• Verified badge — confirms the identity of your contact. Verify contacts in person by comparing fingerprints.
• Emergency Delete — destroys all SecureCall data (keys, contacts, call history, settings) in under one second.
• Anti-Recording — detects screen recording apps, spy software, and unauthorized microphone access in real time.

Common Issues

Quick fixes for the most common problems. For detailed troubleshooting, see the Troubleshooting Guide.

• No audio during call — raise the media volume on your device, disable any active VPN, and try switching between WiFi and Mobile Data.
• Call disconnected — check your WiFi or Mobile Data connection. If the connection dropped, tap the Reconnect button to re-establish the call.
• Contact not found — verify the SecureCall ID format is correct. The contact must have SecureCall installed and registered.
• Ads during call — upgrade to Pro tier to remove ads completely. On the Free tier, ads are paused automatically during active calls.