Call Prefix *67 *82 *70 #31#
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About this app
📱 Call Prefix – *67, 82, 70, #31#
Need to add a prefix, suffix, or special code before calling?
With Call Prefix, you don’t need to edit your contacts anymore. The app automatically inserts codes like *67, *82, *70, 10-10-XXX, #31#, and more — instantly applied to your outgoing calls.
✨ Key Features
➕ Automatic prefixes and suffixes without touching your contacts
📲 Smart widgets: manage prefixes, suffixes, and caller ID directly from your home screen
🕵️ Anonymous calls: quickly enable/disable *67 or #31# to hide your number
☎️ Per-call options:
*67 → Hide Caller ID
*82 → Show Caller ID (unblock)
*70 → Disable Call Waiting
10-10-XXX → Carrier dial-around codes
⏸️ Skip operator voice messages (where supported) after a few seconds
🌍 International control: remove or replace “+” and “00” for easier international dialing
🆘 Emergency numbers automatically excluded for safety
🔐 Privacy & Security
❌ No access to your contacts
❌ No personal data collected
✅ All numbers are processed locally on your device
💎 Usage Modes
🎁 Free trial: 24 hours of full access after first install (no charge)
🎬 Rewarded ads: watch a short video to extend usage by 1 day (max 5/day, every 30 min)
💳 Premium: one-time payment ($4.99) for lifetime unlimited use (no subscription, no auto-renewal)
⚙️ Requirements
📱 Android 10 or higher (API 29+)
⚙️ Must be set as Call Redirection Manager
🔋 Recommended: exclude from battery optimization
📌 Compatibility
✅ Optimized for: Samsung, Google Pixel, Motorola, OnePlus, Xiaomi/Redmi, Huawei/Honor, Vivo
❌ Not compatible: Oppo and Realme (system-level block)
⚠️ Known issue: some Samsung/Xiaomi devices on Android 15 handle pauses (commas) differently, which may affect skipping operator messages
🔎 Common Use Cases
Hide your number with *67 or #31#
Show your number again with *82
Disable call waiting with *70 during important calls
Use 10-10-XXX codes for alternative carriers
Manage everything directly from widgets
⭐ Call Prefix is the easiest, fastest, and safest way to manage prefixes, hide or show caller ID, and handle special dialing codes — without touching your contacts.
⚠️ This app is independent and not affiliated with any carrier. Codes and services may vary by country, region, and mobile operator.
Need to add a prefix, suffix, or special code before calling?
With Call Prefix, you don’t need to edit your contacts anymore. The app automatically inserts codes like *67, *82, *70, 10-10-XXX, #31#, and more — instantly applied to your outgoing calls.
✨ Key Features
➕ Automatic prefixes and suffixes without touching your contacts
📲 Smart widgets: manage prefixes, suffixes, and caller ID directly from your home screen
🕵️ Anonymous calls: quickly enable/disable *67 or #31# to hide your number
☎️ Per-call options:
*67 → Hide Caller ID
*82 → Show Caller ID (unblock)
*70 → Disable Call Waiting
10-10-XXX → Carrier dial-around codes
⏸️ Skip operator voice messages (where supported) after a few seconds
🌍 International control: remove or replace “+” and “00” for easier international dialing
🆘 Emergency numbers automatically excluded for safety
🔐 Privacy & Security
❌ No access to your contacts
❌ No personal data collected
✅ All numbers are processed locally on your device
💎 Usage Modes
🎁 Free trial: 24 hours of full access after first install (no charge)
🎬 Rewarded ads: watch a short video to extend usage by 1 day (max 5/day, every 30 min)
💳 Premium: one-time payment ($4.99) for lifetime unlimited use (no subscription, no auto-renewal)
⚙️ Requirements
📱 Android 10 or higher (API 29+)
⚙️ Must be set as Call Redirection Manager
🔋 Recommended: exclude from battery optimization
📌 Compatibility
✅ Optimized for: Samsung, Google Pixel, Motorola, OnePlus, Xiaomi/Redmi, Huawei/Honor, Vivo
❌ Not compatible: Oppo and Realme (system-level block)
⚠️ Known issue: some Samsung/Xiaomi devices on Android 15 handle pauses (commas) differently, which may affect skipping operator messages
🔎 Common Use Cases
Hide your number with *67 or #31#
Show your number again with *82
Disable call waiting with *70 during important calls
Use 10-10-XXX codes for alternative carriers
Manage everything directly from widgets
⭐ Call Prefix is the easiest, fastest, and safest way to manage prefixes, hide or show caller ID, and handle special dialing codes — without touching your contacts.
⚠️ This app is independent and not affiliated with any carrier. Codes and services may vary by country, region, and mobile operator.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
What’s new
🔥 NEW: Theme Menu - System/Light/Dark directly from main menu
• Improved accessibility: labels for buttons, icons and fields
• Extended localization: theme and screens translated to EN, RU, PT-BR, SV
• Improved stability and bug fixes
• Improved accessibility: labels for buttons, icons and fields
• Extended localization: theme and screens translated to EN, RU, PT-BR, SV
• Improved stability and bug fixes
App support
About the developer
Martina Schranz
info@martygilab.com
Via Sempione Nord, 19
28838 Stresa
Italy
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