Did you know your smartphone has hidden codes that unlock secret features? These secret codes, also known as USSD codes or engineering mode codes, allow users to access hidden settings, test hardware, and troubleshoot issues. In this guide, we reveal hidden phone codes for brands like Vivo, OnePlus, Samsung, Oppo, Xiaomi/Redmi, Tecno, and iPhone (iOS). Plus, we’ll show you how to discover even more codes using a special app available on the Play Store.
📱 Hidden Phone Codes for Popular Brands
📱 Vivo Secret Codes
- ☎ *#558# – Access Engineering Mode
- ☎ *#06# – Check IMEI Number
- ☎ *#*#4636#*#* – Test phone screen, speaker, battery, and network details
- ☎ *#*#273283*255*663282*#*# – Backup All Media Files
- ☎ *#*#0842#*#* – Test Vibration and Backlight
- ☎ *#0228# – Battery Refresh Code
- ☎ *#*#900#*#* – Battery Status Reset & Cache Cleanup
Want to explore a complete list of Vivo codes? Try the Play Store app—we’ve provided the download link below!
🌟 OnePlus Secret Codes
- ☎ *#808# – Enter Factory Mode
- ☎ *#1234# – View Software Version
- ☎ *#*#4636#*#* – Test phone network, battery info, and usage stats
- ☎ *#*#3264#*#* – Check RAM Version
- ☎ *#*#1111#*#* – FTA Software Version
- ☎ *#0228# – Battery Refresh Code
- ☎ *#*#9900#*#* – Battery Status Reset & Cache Cleanup
Looking for more OnePlus hidden codes? Check out the Play Store app using the download link below!
📱 Samsung Secret Codes
- ☎ *#0#* – Samsung Hardware Test
- ☎ *#06# – IMEI Number Display
- ☎ *#*#4636#*#* – Test screen, network, and battery performance
- ☎ *#0228# – Battery Status & Refresh
- ☎ *#*#9900#*#* – Battery Status Reset & Cache Cleanup
- ☎ *#7353# – Quick Hardware Test
Need a full list of Samsung secret codes? Try the Play Store app—we’ve shared the download link below!
🌟 Oppo Secret Codes
- ☎ *#800# – Enter Engineering Mode
- ☎ *#06# – IMEI Number Display
- ☎ *#*#4636#*#* – Test phone sensors, battery, and network
- ☎ *#*#7594#*#* – Power Off Phone Instantly
- ☎ *#*#7780#*#* – Factory Reset Without Data Deletion
- ☎ *#*#2664#*#* – Touch Screen Test
- ☎ *#0228# – Battery Refresh Code
- ☎ *#*#9900#*#* – Battery Status Reset & Cache Cleanup
Want more Oppo secret codes? Check out the Play Store app using the download link below!
📱 Xiaomi/Redmi Secret Codes
- ☎ *#*#6484#*#* – Hardware Test Mode
- ☎ *#06# – IMEI Number Check
- ☎ *#*#4636#*#* – Test battery, phone, and network information
- ☎ *#*#273282*255*663282*#*# – Media Backup
- ☎ *#*#7780#*#* – Reset User Data
- ☎ *#0228# – Battery Refresh Code
- ☎ *#*#9900#*#* – Battery Status Reset & Cache Cleanup
Looking for an extended Xiaomi/Redmi code list? Try the Play Store app—we’ve provided the download link below!
🌟 Tecno Secret Codes
- ☎ *#*#4636#*#* – Test battery, WiFi, and signal strength
- ☎ *#06# – IMEI Number Display
- ☎ *#*#197328640#*#* – Engineering Mode
- ☎ *#*#0842#*#* – Vibration Test
- ☎ *#*#232339#*#* – Wireless LAN Test
- ☎ *#0228# – Battery Refresh Code
- ☎ *#*#9900#*#* – Battery Status Reset & Cache Cleanup
Need additional Tecno secret codes? Check out the Play Store app using the download link below!
🔍 Additional Hidden Features of Secret Codes
📶 Network & Signal Strength Codes
- ☎ *#*#4636#*#* – Check network information and signal strength
- ☎ *#0011# – Access Service Mode on Samsung
- ☎ *#*#197328640#*#* – Test RF and signal reception
🔋 Battery Performance & Optimization Codes
- ☎ *#0228# – Battery Refresh for all devices
- ☎ *#*#9900#*#* – Battery Cache Cleanup
- ☎ *#*#0842#*#* – Test battery vibration response
🎵 Audio & Speaker Test Codes
- ☎ *#*#0673#*#* – Audio test mode
- ☎ *#*#0289#*#* – Speaker & volume test
- ☎ *#*#1472365#*#* – GPS test mode
🔍 Additional Hidden Features of Secret Codes
📶 Network & Signal Strength Codes
- ☎ ##4636## – Check network information and signal strength
- *☎ #0011# – Access Service Mode on Samsung
- ☎ ##197328640## – Test RF and signal reception
🔋 Battery Performance & Optimization Codes
- *☎ #0228# – Battery Refresh for all devices
- ☎ ##9900## – Battery Cache Cleanup
- ☎ ##0842## – Test battery vibration response
🎵 Audio & Speaker Test Codes
- ☎ ##0673## – Audio test mode
- ☎ ##0289## – Speaker & volume test
- ☎ ##1472365## – GPS test mode
🖥️ Display & Touchscreen Codes
- ☎ ##2663## – Check touchscreen version
- ☎ ##2664## – Touchscreen test
- ☎ ##1111## – Software version check
📸 Camera & Sensor Test Codes
- ☎ ##34971539## – Camera firmware check
- ☎ ##0588## – Proximity sensor test
- ☎ ##232331## – Bluetooth test
🔑 Security & Lock Settings Codes
- ☎ ##7594## – Change power button behavior
- ☎ ##7780## – Reset user settings
- ☎ ##8351## – Enable call voice recording
📝 FAQs
1. Are secret phone codes safe to use?
Yes, but be cautious! Some codes reset your device or change settings that can’t be undone easily.
2. Do these codes work on all devices?
No, different brands and models have unique codes. Check your manufacturer’s official documentation for details.
3. Can I find all secret codes in one place?
Yes! A dedicated app on the Play Store lists all hidden codes.
4. Why don’t manufacturers publicly share these codes?
These codes are mainly for technicians and advanced users for debugging and testing purposes.
5. Will using secret codes void my warranty?
No, unless you use codes that alter system settings or reset the device improperly.
🔍 Final Thoughts
Knowing these secret phone codes can help you unlock hidden features, troubleshoot issues, and explore advanced settings on your smartphone. Whether you own a Samsung, iPhone, OnePlus, Xiaomi, Vivo, Tecno, or Oppo device, these codes can be game-changers. Want to unlock even more codes tailored to your device? Try the Play Store app!
