Smartphones aren’t just about flashy apps and sleek interfaces — they also come with hidden menus, diagnostics tools, and secret testing modes that you can unlock with special dialer codes.
Whether you’re using a Samsung Galaxy, an iPhone, a Xiaomi phone, or a Realme device, there are USSD and MMI codes that give you access to deep system information, hardware testing features, and carrier-specific settings.
In this guide, we’ve compiled the largest, most up-to-date collection of smartphone secret codes in 2025, categorized by brand and use case.
🔍 What Are Secret Smartphone Codes?
Secret smartphone codes, also known as USSD (Unstructured Supplementary Service Data) or MMI (Man-Machine Interface) codes, are special combinations of symbols and numbers entered into your phone dialer. They are not visible in the standard menu and are often used by:
- Developers
- Repair technicians
- Mobile network engineers
- Advanced users
These codes can help:
- Access hidden menus
- Test hardware (speaker, display, sensor)
- View detailed phone/battery/network info
- Enable/disable advanced features
⚠️ Warning: Some codes can perform factory resets or change important settings. Use them with caution.
✅ Universal Smartphone Codes (Work on Most Android & iPhones)
| Code | Function |
|---|---|
*#06# | Displays IMEI number |
*#*#4636#*#* | Phone, battery, usage, and Wi-Fi info |
*#*#7780#*#* | Factory data reset (erases user data) |
*#*#8351#*#* | Enable voice call logging |
*#*#8350#*#* | Disable voice call logging |
*#*#1472365#*#* | GPS Test |
*#*#232339#*#* | Wireless LAN test |
These codes may not work on all phones due to software restrictions or regional lockouts.
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🍎 Apple iPhone Secret Codes
Unlike Android, Apple doesn’t support USSD for diagnostics, but you can access some hidden functions via these codes:
| Code | Function |
|---|---|
*3001#12345#* | Field Test Mode (signal strength, cell tower info) |
*#06# | Display IMEI number |
*#67# | Call forwarding status when busy |
*#61# | Call forwarding status if unanswered |
*#21# | Check all diversion settings |
*#31# | Hide your caller ID |
📌 Note: These codes open system-level call/network settings and do not offer hardware diagnostics like Android.
📱 Samsung Secret Codes (One UI 6 / Android 14)
Samsung phones offer one of the most powerful hidden menus for diagnostics:
| Code | Function |
|---|---|
*#0*# | General test mode (display, speaker, vibration, etc.) |
*#0228# | Battery status and ADC readings |
*#0011# | Service Mode (network & signal strength) |
*#1234# | Firmware version |
*#32489# | Encryption and security info |
*#12580*369# | HW & SW version |
*#0808# | USB settings (media transfer/debug mode) |
*#2663# | Touchscreen firmware |
*#9090# | Diagnostic configuration |
*#7465625# | Check SIM lock status |
🔴 Xiaomi / Redmi / POCO (MIUI 14/15)
| Code | Function |
|---|---|
*#*#6484#*#* | Full hardware test mode (QC Test) |
*#*#4636#*#* | Battery/Wi-Fi/Phone info |
*#*#8255#*#* | GTalk Service Monitor |
*#*#232338#*#* | Wi-Fi MAC address |
*#*#1234#*#* | MIUI Build info |
*#*#1111#*#* | FTA Software version |
*#*#2222#*#* | FTA Hardware version |
🟡 Realme / Oppo (ColorOS)
| Code | Function |
|---|---|
*#*#3646633#*#* | Engineer Mode (MediaTek SoC only) |
*#808# | Hardware Test Mode |
*#888# | Hardware version & QR code |
*#6776# | Software version |
*#1234# | Firmware info |
📌 Note: Many codes may not work in newer ColorOS 14+ due to UI restrictions.
🟢 Vivo Secret Codes
| Code | Function |
|---|---|
*#558# | Hardware test menu |
*#*#4838#*#* | Testing menu |
*#*#7777#*#* | Factory reset |
*#06# | IMEI number |
🔵 OnePlus (OxygenOS 14+)
| Code | Function |
|---|---|
*#808# | Hardware diagnostics |
*#1234# | Software version |
*#801# | Engineering Mode (ADB/root only) |
*#06# | IMEI |
🔮 Huawei / Honor
| Code | Function |
|---|---|
*#*#2846579#*#* | Project menu (network, updates) |
*#*#1472365#*#* | GPS test |
*#*#232339#*#* | Wi-Fi test |
*#06# | IMEI |
📘 Motorola (Android One)
| Code | Function |
|---|---|
*#*#2486#*#* | CQATest hardware test |
*#*#4636#*#* | Usage and battery info |
##7764726 | Verizon menu (carrier-specific) |
🔹 Nokia (Android One Series)
| Code | Function |
|---|---|
*#*#4636#*#* | Testing info |
*#06# | IMEI number |
*#*#7780#*#* | Factory reset |
⚠️ Warning: Use With Caution
- ⚠️ Some codes perform irreversible actions like resetting your device.
- 📵 Some codes are disabled by default on carrier-locked or newer phones.
- 🧪 Use only the codes you understand — especially those under “engineer mode” or “reset.”
📚 Frequently Asked Questions (FAQ)
Q1: Why don’t some codes work on my phone?
Some codes are disabled by manufacturers, carriers, or vary based on Android version.
Q2: Can I unlock hidden features using these codes?
Yes, but most features are read-only. Some may unlock test modes or settings.
Q3: Will using secret codes void my warranty?
No, simply entering codes usually doesn’t void warranty — unless you change system settings or root the device.
Q4: Are these codes safe to use?
Most are safe if used to view information. Avoid reset or engineer codes unless you’re sure.