Shows a summary of calendar storage and events like birthdays and anniversaries. 2. Hardware & Diagnostic Codes How to Use Secret Codes in XIAOMI Mi 10T – Hidden Modes

: Automatically saves a snapshot of software logs to your internal storage. Important Precautions How to Use MMI and USSD Codes for Android - wikiHow 12 Nov 2025 —

: Shows real-time charging status, battery health parameters, and cycles. *#*#6484#*#* Hardware Test (CIT)

This is perhaps the only "secret" code that actually works on every phone, including landlines.

Displays the unique IMEI numbers and serial numbers for your device. This is crucial for insurance or if your phone is stolen.