*#06#	- IMEI is a unique 15-digit serial number
##3646633## or ##54298##	- Engineering Mode (for smartphones based on MTK processor)
##4636##	- Displaying Phone Information (Phone, Battery, WiFi and other)
##225##	- This code show the number of festivities and events in your calendar
##426##	- Google Play service - Debug information
##759##	- Rlz Debug UI. Unique Device ID, PID, ACAP other data related to application installation.
##36245##	- Display a debug information about your registered email id
##8255##	- Used to launch G Talk Service Monitor
##64663##	- Engineering Mode (Version, WLAN, Bluetooth, Battery, Speakers)
##7780##	- Factory Data Reset.
27673855#	- The firmware of the device is completely reinstalled
##232338##	- Display the MAC address of the Wi-Fi network
##34971539##	- Shows complete camera information
##1234##	- PDA and Phone firmware info
##7594##	- Changing the power button behavior-Enables direct poweroff once the code enabled
##1472365##	- For a quick GPS test
##273283255663282##*	- For a quick backup to all your media files
##1575##	- GPS Test Code
##197328640##	- Enabling test mode for service activity
##0283##	- Packet Loopback test
*#0228#	- battery calibration

##232339## OR ##526##	- Wireless Lan Tests
##0##*	- LCD test Code
##3264##	- Ram version
##1111##	- FTA Software version
##2664##	- Touch-Screen test
##0588##	- Proximity Sensor Test
##8351##	- Enables voice dialing logging mode
##232331##	- Bluetooth Test Mode
##232337#*#	- Show device's Bluetooth address
##7262626##	- Field test
##0289## OR ##0673##	- Audio test
##0842##	- Device test (vibration test and backlight test)
##2663##	- Show touch-screen version
##44336##	- Displays Build time and change list number
##49862650468##*	- PDA, Phone, Hardware, RF Call Date firmware info
##8350##	- Disables voice dialing logging mode
##2222##	- FTA Hardware verion

GSM codes for Tecno Camon 19 Pro Mondrian Edition

USSD Codes For Call Forwarding
##002#	- Disable All Call Forwarding
*004PhoneNumber#	- Set all configured call diversions to PhoneNumber
##004#	- Unregister all configured call diversions

Set Call Forward All
*21PhoneNumber#	- Register and activate divert all calls to PhoneNumber
##21#	- Unregister divert all calls
*21#	- Activate divert all calls
#21#	- Deactivate divert all calls
*#21#	- Check status of divert all calls

Call diversion when "no answer"
*61PhoneNumber#	- Register and activate divert on no answer to PhoneNumber
##61#	- Unregister divert on no answer
*61#	- Activate divert on no answer
#61#	- Deactivate divert on no answer
*#61#	- Check status of divert on no answer

Set call forwarding in case of "not available"
*62PhoneNumber#	- Register and activate divert on not reachable
##62#	- Unregister divert on not reachable
*62#	- Activate divert on not reachable
#62#	- Deactivate divert on not reachable
*#62#	- Check status of divert on not reachable

Set up call diversion in case of "busy"
*67PhoneNumber#	- Register and activate divert on busy
##67#	- Unregister divert on busy
*67#	- Activate divert on busy
#67#	- Deactivate divert on busy
*#67#	- Check status of divert on busy all call types
#6711#	- Check status of divert on busy voice calls
#6713#	- Check status of divert on busy fax calls
#6725#	- Check status of divert on busy data calls

Set barring of all outgoing calls
*33code#	- Activate barr all outgoing calls (for code see "Safety" above)
#33*code#	- Deactivate barr all outgoing calls
*#33#	- Check status of barr all outgoing calls

Block all calls
*330code#	- Activate barr all calls
#330*code#	- Deactivate barr all calls
#330code#	- Check status of barr all calls

Activate barr all outgoing international calls
*331code#	- Activate barr all outgoing international calls
#331*code#	- Deactivate barr all outgoing international calls
#331code#	- Check status of barr all outgoing international calls

USSD Codes For Barring all outgoing international calls except home country
*332code#	- Activate barr all outgoing international calls except home country
#332*code#	- Deactivate barr all outgoing international calls except home country
#332code#	- Check status of barr all outgoing international calls except home country

Set barring of all outgoing calls
*333code#	- Activate barr all outgoing calls
#333*code#	- Deactivate barr all outgoing calls
*#333#	- Check status of barr all outgoing calls

Set barring of all incoming calls
*35code#	- Activate barr all incoming calls
#35*code#	- Deactivate barr all incoming calls
*#35#	- Check status of barr all incoming calls

Block all incoming calls when roaming
*351code#	- Activate barr all incoming calls when roaming
#351*code#	- Deactivate barr all incoming calls when roaming
*#351#	- Check status of barr all incoming calls when roaming

Activate barr all incoming calls
*353code#	- Activate barr all incoming calls
#353*code#	- Deactivate barr all incoming calls
*#353#	- Check status of barr all incoming calls

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Tecno Camon 19 Pro Mondrian Edition secret codes

New phones.