Secret Code ( GT - S5570 )

*#*#0283#*#* packet loopback
*#*#0*#*#* to test LCD
*#*#0673#*#* melody test
*#*#0842#*#* vibration test and backlight test
*#*#2664#*#* Test your touch screen
*#*#0588#*#* proximity sensor test
*#*#3264#*#* ram version
*#*#4636#*#* phone information
*2767*3855# hard reset*
*#*#7780#*#* factory reset**
*#*#7594#*#* change end call/power option
*#*#197328640#*#* service mode
*#*#273283*255*663282*#*#* file copy screen (backup media files)
*#*#526#*#* wlan test
*#*#232338#*#* shows wifi mac address
*#*#1472365#*#* gps test
*#*#1575#*#* another gps test
*#*#232331#*#* bluetooth test
*#*#232337#*# shows bluetooth device address *#*#8255#*#* gtalk service monitor

*#*#2663#*#* Check touch screen version <-- KATANYA BAHAYA

Sumber : Google