Perhaps only the geeks would be interested in this but it is good to know that with just a few keystrokes from your phones, you can get your hands into the innards of your device.

Most of these codes are guaranteed to work on any Samsung Android device.

**USE WITH CAUTION**

*#0*# — SensorDiagnotics
*#03# — NAND Flash S/N
*#80# — Touchscreen noise test (warning do not press power button)
*#251# — Wakelock ON
*#250# — Wakelock OFF
*#350# — Reboot
*#526# — WLAN Engineering Mode
*#528# — WLAN Engineering Mode
*#745# — RIL Dump Menu
*#746# — Debug Dump Menu
*#0011# — ServiceMode
*#0228# — Battery status
*#0283# — Audio packet loopback test
*#0289# — Audio/speaker test (Melody Test Mode)
*#0514# — SysDump (System Dumps, logs, etc)
*#0588# — Proximity Sensor test
*#0589# — Light Sensor Test Mode
*#0673# — Audio/speaker test (same as 0289)
*#0782# — Real Time Clock Test
*#0842# — Vibration Test
*#1575# — GPS Control Menu
*#2263# — RF Band Selection
*#2663# — Touchscreen FW and version
*#2664# — HW touchscreen test
*#3264# — RAM CHECK (Version number)
*#4327# — HDCP INFO (True/ false)
*#7769# — PROXIMITY SENSOR TEST
*#7284# — Phone Utility (USB Settings)
*#7353# — Self Test (Menu of 12 tests to use)
*#7594# — Factory mode Enable shutdown on long press
*#8888# — Service Mode (Read FTA hw version)
*#9900# — System Dump Mode
*#9999# — SW Versions (AP, CP, CSC, FTA SW)
*#22235# — ACCELEROMETER SENSOR INFO
*#86824# — TOUCH KEY SENSITIVITY
*#5238973# — LCD TYPE
*#232331# — BT test
*#232337# — BT address
*#232338# — WLAN MAC address & PS mode
*#232339# — WLAN Engineering Mode test (TX & RX modes) (same 526)
*#272886# — Auto Answer Selection
*#3214789# — GCF Mode Status
*#8736364# — OTA Update Menu
*#7412365# — Camera Firmware Standard (Front/Rear Cam FW)
*#7465625# — Personalization (Lock Status settings)
*#22558463# — Reset Total Call Time
*#12580*369# — Main Version (AP, CP, CSC, RF cal, HW Rev) (similar to 9999)
*#197328640# Service Mode
*#3282*727336*# — System and Storage Information (Data Usage Status)
*#273283*255*3282*# — Adjust/Fill Message, Contact, Call Log, etc Limits
*#273283*255*663282*# — Data Create SD Card
*#7328735824# — LOT ID
*#7780# — Factory Reset (WARNING)
*2767*3855# — Full Factory Reset ( Gives NO WARNING)

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