(secreat code in android)How to know the phone, battery , wifi information in android  without using any app:

How to know the phone, battery , wifi information in android  without using any softwares :
    
To know the phone, battery , wifi information in android  without using any apps just dial       
            *#*#4636#*#*
Code and following screen will display .....
          and you can see all the info..about phone ,wifi, battery....
    

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