Android phone secret codes

• *#*#1234#*#* : PDA and Phone
• *#*#1111#*#* : FTA SW version
• *#*#2222#*#*: FTA HW version
• *#*#7780#*#* : factory reset (memory card data will not be reset)
• *2767*3855# : Factory Reset (Memory card data will be reset)
• *#*#197328640#*#* : Launch service mode to test and change certain settings
• *#*#232339#*#* or *#*#526#*#* or *#*#528#*#* : Test Wi-Fi
• *#*#232338#*#* : Display Wi-Fi MAC address
• *#*#44336#*#* : PDA, Phone, build time and other details
• *#*#0283#*#* : Packet Loopback
• *#*#0*#*#* : LCD test
• *#*#0673#*#* or *#*#0289#*#* : Melody test
• *#*#4636#*#* : Display cell phone, battery, usage statistics and Wi-Fi information
• *#*#1472365#*#* :GPS test
• *#*#1575#*#* : Other GPS test
• *#*#232331#*#* : Bluetooth test
• *#*#232337#*# : Display Bluetooth physic address
• *#*#8255#*#*:  Start Gtalk monitoring
• *#*#4986*2650468#*#* : PDA, Phone, H/W, RFCallDate
• *#*#0842#*#* : Device test such as vibration and lightness
• *#*#2663#*#* : Display touchscreen version
• *#*#2664#*#* : Touchscreen test
• *#*#0588#*#* : Distance sensor test
• *#*#3264#*#* : Display memory version

some of this codes can change your system settings, so use with caution at your own risk.