Secret Codes of Samsung 2019 include the android secret code of Samsung.
Secret Codes of Samsung include:
• Network
• GPS
• Bluetooth
• WLAN test
• Firmware version information
• factory tests PDA
• Usage statistics Check Update
• Reset Device
• Unlock the device
• Recover Forgotten pattern
• Engineering mode
• GPS test mode
• Touch Test
• Screen Test
• Test Device is original or copy
• check battery timing
• Machine information
• Software Information
• Hardware Information
• Test Photograph RGB and much more
• display the IMEI number
• Super Mode
• Service Menu
• factory reset
• sim lock
• sim unlock
• Phone information
• Battery information
• Wifi information
• Battery history .

Some code of them may not work on specific devices but you can still try them because their manufacturer does not allow them. You can copy and share it with your friends.
Warning: After execute these hash code your device might be affected. So keep backup your important data before execute hash code.
Note: This is not official Application of Samsung. And also it is read only app and does not made change to user device.