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Here are such 5 important codes:
Code – *#06#
This code displays the IMEI (International Mobile Equipment Identity) number of the phone. It is the phone’s identity number and is unique to each smartphone. If the smartphone has multiple SIM slots then there will be more than one IMEI numbers. Code – *#*#4636#*#*
This code displays a menu that shows the phone’s Internet data usages.
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This code does a display test. It reveals your screen image quality and capacity.
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Code – *#*#34971539#*#*This code displays the precise and detailed information about the cameras on the phone. Code – *#*#232337#*#
This code displays the Bluetooth address of the phone. Code – *#*#7262626#*#*
This is a very useful code. It displays the precise strength of the signal at a particular field. As mentioned earlier, these codes are pre-set in all smartphones, however, some mobile telephony service providers deactivate these codes. If these codes do not work on a smartphone then check with the service provider and request activation of these codes.