*#06# - To display IMEI Information

*#0*# or *#12345# - the code to reset all test data

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Common Secret Codes for Button Phones

1. *#06#

Shows your phone’s IMEI number.



2. *#0000# (For Nokia phones)

Shows the software version of the phone.



3. *#92702689# (Nokia – also typed as *#war0anty#)

Opens warranty menu, shows:

Serial number

Manufacturing date

Last repair date

Life timer (total usage)




4. *#2820#

Displays the Bluetooth device address.



5. *#7780#

Soft reset (resets settings to default but keeps data).



6. *#7370#

Hard reset – erases everything (like factory reset).



7. *#21#

Checks if call forwarding is active.



8. ##002#

Cancels all call forwarding settings.



9. *#7328748263373738# (Nokia only)

Activates security code – be careful, its hidden for security purposes.



10. *#61# / *#62# / *#67#



View different call diverting settings (when busy, unreachable, no answer).



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MediaTek-Based Button Phones (like Itel, Tecno, Symphony)

1. *#220807# or *#8375#

Shows software version (works on many Itel/Tecno feature phones).



2. *#66*#

Opens engineer mode (hardware test menu – not always available).



3. *#36446337# (also *#*#3646633#*#* on some)

Opens Engineer/Factory mode – allows testing of audio, display, SIM, battery, etc.

Secret Android USSD Codes

1. *#*#4636#*#*

Opens a hidden Testing menu where you can:

View phone info (signal strength, IMEI, etc.)

Check battery status and health

View app usage statistics

Get Wi-Fi and network details




2. *#0*#

Opens the hardware test menu (works on most Samsung devices).
You can test:

Screen colors

Touch sensitivity

Camera

Vibration

Sensors




3. *#*#7780#*#*

Performs a soft factory reset
(resets apps and settings but keeps personal data like photos and music).



4. *2767*3855#

Performs a full factory reset (erases everything, including internal storage – dangerous if not backed up).



5. *#*#7594#*#*

Changes your power button behavior to immediately shut down the phone without showing a confirmation menu.



6. *#*#273282*255*663282*#*#*

Opens the media backup menu (lets you back up images, audio, etc., depending on the phone).



7. *#*#1472365#*#*

Opens the GPS test menu – helps check the GPS performance and accuracy.



8. *#*#232339#*#*

Tests Wi-Fi connectivity and performance.



9. *#*#197328640#*#*

Opens Service Mode for advanced testing and debugging (for developers or technicians).