1. Go to your phone dialer and type any of these codes;

Engineer mode

Huge list of developer options for testing touch,gps,wifi,display,etc.
*#*#3646633#*#*

Samsung Logo
“Registers” you phone and make the boot logo the original Samsung.
*#*#91#*#*

Testing Menu
Various testing options
*#*#4636#*#*

Language And Input
Language and Keyboard settings
*#*#97#*#*

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Reset Sim
This was a SIM reset on the 77.
*#*#46*#*#

Google Talk Service Monitor
Complete monitor For Google Talk.
*#*#8255#*#*

For more Info see this thread XDA

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