Mobile brands
Pick a manufacturer to see every verified secret code, USSD dial and diagnostic shortcut for that brand.
Samsung Galaxy phones expose an extensive service menu through USSD dial codes. Use these to check hardware, view firmware details, run built-in diagnostics, and pull IMEI or battery health data on any modern Galaxy device.
iOS restricts most low-level access, but a handful of universal GSM codes still work on iPhone for IMEI display, call forwarding, caller-ID toggles, and the Field Test Mode used for signal debugging.
Xiaomi devices running MIUI and HyperOS support the standard Android CIT (Component Integration Test) menu plus dozens of brand-specific codes for camera, sensors, battery and network testing.
Google Pixel phones expose the classic AOSP testing menu, letting you check Wi-Fi, GPS, sensors and radio info directly from the dialer with a small set of well-supported codes.
OnePlus keeps a dedicated engineering-mode menu accessible via secret codes for touchscreen tests, backlight checks, and detailed hardware validation across the Nord and flagship series.
Huawei phones on EMUI and HarmonyOS support both the shared Android codes and brand-specific project menus for hardware and radio testing.
Motorola runs near-stock Android, so most universal Android testing codes work, along with a small set of Moto-specific service codes for factory data resets and radio info.
Oppo ColorOS devices support engineering-mode codes for background debug, factory tests, and IMEI operations across Reno, Find and A-series lineups.
Vivo phones running Funtouch OS and OriginOS expose test menus and service codes covering LCD, camera, speaker, and network verification.