These are some of the important Android Mobile tricks you must need to know:
Cell Battery, WiFi
Usage etc Info *#*#4636#*#*
Restore Factory Settings
*#*#7780#*#*
Format Phone
*2767*3855# Launch service mode*#*#197328640#*#*
Test WiFi
*#*#232339#*#* or
*#*#526#*#* or
*#*#528#*#*
Device test such as vibration and lightness
*#*#0842#*#*
Display touchscreen version *#*#2663#*#*
Touchscreen test
*#*#2664#*#* Distancesensor test*#*#0588#*#*
Display memory version
*#*#3264#*#*
Display WiFi MAC address*#*#232338#*#* GPS test
*#*#1472365#*#*
Other GPS test
*#*#1575#*#*
Bluetooth test*#*#232331#*#*
Display Bluetooth physic address*#*#232337#*#
Start Gtalk monitoring
*#*#8255#*#*
PDA, Phone, H/W, RFCallDate*#*#4986*2650468#*#*
PDA and Phone
*#*#1234#*#*
FTA SW version
*#*#1111#*#*
FTA HW version*#*#2222#*#* PDA, Phone, csc,
*#*#44336#*#*
Packet Loopback
*#*#0283#*#*
LCD test *#*#0*#*#*
Melody test*#*#0673#*#*
or
*#*#0289#*#*
