Some of usefull codes for all andoid phones like defy, samsung galaxy etc

Phone and Battery information Code: *#*#4636#*#*

Factory Data reset Code: *#*#7780#*#*
This code is used for a factory data reset.

This will erase all data from your phone`s internal storage, including

Google account
System and application data and settings
Downloaded applications
Option to format USB storage

Full Factory Format Code: *2767*3855# (Dangerous)

many more is on some useful secret code for all android


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