Engineering Mode Codes for MTK devices

Android phones with MediaTek chips have Engineering Mode which enable the user to see some hidden info about their devices, test and tweak some features be it software or hardware. 
Normally we use apps like Mobile Uncle or MTK Engineering Mode app to access this mode but I will be showing you various dailing codes you can use to access this Engineering Mode on MTK devices without using those apps.

Note

Not all MediaTek devices support these codes

Be careful of what you change in this mode, inappropriate action may brick your device.

To use any of the code below, open your dialer and enter

*#*#3646633#*#*

*#3646633#*#*

*#*#788378#*#*

*#*#1478963#*#*

*#*#36951#*#*

*#*#8838#*#*

*#15963#*

*#*#33#*#*

*#*#00#*#*

*#1949#*

*#1942#*

*#78837#

*#1942#*