Here’s a structured, interesting summary of how to use secret codes on the (MIUI/HyperOS), including what works, what doesn’t, and safety tips. 1. What Are “Secret Codes”? Secret codes (USSD/MMI codes) are numeric strings you dial in the Phone app to access hidden menus, test hardware, or retrieve device info (IMEI, battery stats, sensors).
Would you like a step‑by‑step screenshot guide for accessing the hardware test menu? How to Use Secret Codes on XIAOMI 11T Pro
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