Call Prefix & Caller ID Codes

📱 Call Prefix – Hide Your Number, Anonymous Calls, Prefix & Suffix Codes

Want to hide your caller ID, make an anonymous call, or automatically add a prefix, suffix, or special code to outgoing calls — without editing your contacts?

Call Prefix automatically applies codes like #31# (to hide your number), and other prefix/suffix codes to the numbers you dial, so you never have to type them manually. Perfect for dual SIM phones, work SIMs, secondary numbers, anonymous calls, and carrier service codes.

✨ Key features

➕ Automatically adds prefixes and suffixes to calls
🕵️ Hide your caller ID and make anonymous calls with #31#
📲 Quick home-screen widgets to turn codes on or off
⏸️ Automatically skips carrier voice announcements, where supported
🌍 International number handling with + and 00 replacement or removal
🆘 Emergency numbers are automatically excluded for safety
🔀 SIM filter: on dual SIM phones the prefix applies only to the SIM you choose
✏️ Rename your SIMs in the list (e.g. "Work") with a long press
📖 Built-in guide: how to set the SIM per contact and what happens hands-free

🔐 Privacy & security

❌ No access to your contacts
❌ No personal data collection
✅ All numbers are processed locally on your device

💎 How it works

🎁 Free trial: 24 hours of full access after first install
🎬 Video reward: +1 day of access for every video watched
💳 Premium: one-time purchase for lifetime unlimited use, no subscription

⚙️ Requirements

📱 Android 10 or higher
⚙️ The app must be set as your call redirection handler
🔋 Battery optimization exclusion recommended

📌 Compatibility

✅ Works on many Samsung, Xiaomi/Redmi, Motorola, OnePlus, Huawei/Honor, and Vivo devices
❌ Not compatible with some Oppo and Realme devices due to system limitations
⚠️ On some Samsung and Xiaomi Android 15 models, comma pauses may not be handled correctly

🔎 Common use cases

• #31# to hide your number and make anonymous calls
• Prefix codes for compatible business profiles
• Suffix codes for dual-number setups
• Quick codes without typing them every time

⭐ Call Prefix is the simple, fast way to hide your number, make anonymous calls, and manage prefixes, suffixes, and service codes without editing your contacts.

⚠️ This app is independent and not affiliated with any phone carrier. Codes and services may vary by carrier, plan, country, and device.