"Secret Codes, or USSD Codes)

The "Secret Codes" compiled infographics for Android smartphones, especially the Redmi brand (Xiaomi affiliate). These codes are used to print in the phone app (Dialer) to open a hidden menu, test hardware, or see machine insights.

Here are the details of all the codes in the picture, divided into categories for easier reading:

1. System & Device Info

*# 06#: Check IMEI Number (Universal Machine Identification Code)

* # *# 4636♪ * # *: See Phone Info, such as network status, Wi-Fi signals, and usage statistics

* # *# 1111# * # *: Verify the software version (Software Version)

* # *# 2222# * # *: Check the hardware version (Hardware Version)

*# 12580* 369 #: Check GPS Chip Data and Software Version (GPS & Software)

* # * # 34971539 # * *: See Camera Info Insight

2. Advanced Developer and Testing Mode (Engineering & Diagnotics)

* # * # 6484 # * # *: Enter Engineering Mode (or CIT Menu) is a Xiaomi / Redmi universal mode used by technicians for testing all hardware parts of the machine.

* # * # 3646633 # * # *: Advanced Body Test Mode (Phone Test)

* # * # 9099 # * # *: Diagnostic Configuration Settings

* # * # 872564 #: USB connection data recording (USB Logging)

3. Hardware Testing

* # * # 998 # * *: RAM Memory Test

* # * # 8423 # * *: Vibration Test

* # * # 0588 # * *: Test Proximity Sensor (Ear Attachment Sensing Sensor Time of Late Talk to Quench Screen)

* # * # 0 * # * *: Display Test, such as Dead Pixel

* # * # 0673 # * *: Audio Test

* # * # 0269 # * *: Audio Loopback System Tested

* # * # 1472365 # * # *: GPS Signal Test

* # * # 3495 # * *: Camera Test

4. Network & Connectivity Testing

* # * # 526 # * # *: Wireless / Wi-Fi Test

* # * # 232331 # * # *: Bluetooth test

* # * # 0283 # * *: Packet Traffic Test (Packet Loopback)

* # 7465625 #: Check Network Lock SIM Card (Lock Network)

5. Data Management and Reset Machine (Data & Reset)

* # * # 273283 * 255 * 662282 * # * *: Menu for personal backup (Data Backup), such as image or video files

* # * # 7780 # * *: Reset to Factory Default System (Reset to Factory) App and account data will be deleted (be careful to press this code) ⚠️ Caution: Some codes are advanced commands used for technicians or experts. Some codes, when pressed, may result immediately without repeated notification (e.g. reset code). And some Redmi or Android newer smartphones may be blocked from using certain codes for security purposes.