Write this code in your dial pad *#*#4636#*#*
This code use for see your phone, battery and wifi information.
It shows following 4 options on screen:
Phone information
Battery information
Usage statistics
WiFi information
In phone information you can see your phone IMEI,Phone number,current network,signal strength ,network type and lot of other things.
In battery information you can see your battery status,power plug, battery level, battery scale, battery health,voltage,temperature,technology and you can also see time since boot.
In usage statistics and WiFi information you can see battery usage and WiFi status and WiFi config.
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