Android secret codes

Information about phone and batteries *#*#4636#*#*

Reset data like before *#*#7780#*#*

Format Phone
*2767*3855#Launch service mode *#*#197328640#*#*Test WiFi *#*#232339#*#*Log mode service *#*#197328640#*#*

GPS test *#*#1472365#*#*

Other GPS test
*#*#1575#*#*

Bluetooth test *#*#232331#*#*

Displays Bluetooth address
*#*#232337#*#

LCD test
*#*#0*#*#*

Melody test *#*#0673#*#*

Device tests (vibration, and Backlight test)
*#*#0842#*#*

Touchscreen version
*#*#2663#*#*

Touchscreen test *#*#2664#*#*

Proximity sensor test
*#*#0588#*# *

RAM version
*#*#3264#*#*

Factory reset
*2767*3855#