Secret Code of HTC Mobile Phone.

1) *#0*# = Test Utility.
2) *#0289# = Melody test again.
3) *#0673# = Melody test.
4) *#0842# = Vibration test.
5) *#2663# = Touchscreen accuracy test.
6) *#767*3855# = Factory format.
7) ##775# = EPST/PRL – PRL Settings.
8) ##786# = EPST – Status Menu.
9) ##3282# = EPST – Data Programming Menu.
10) ##2539# = EPST/A-Key – Data A key menu.
11) ##7738# = EPST/P_Rev – Protocol Revision.
12) ##8626337# = EPST/Vocoder – Unsure.
13) ##33284# = Debug – Debug Menu.
14) ##3424# = Diagnostic – Connect to phone in diag mode.
15) ##4772579# = Reset the GPS.
16) ##72786# = Changes DSA back to Factory.
17) ##889# = Enables TTY.
18) *#*#34971539#*#* = Update firmwire.
19) *#*#7594#*#* = Change the End Call / Power button action.
20) *#*#273283*255*663282*#*#* = Code opens a file copy screen where you can backup your media files.
21) *#*#197328640#*#* = Enter into Service mode.
22) *#*#232339#*#* = WLAN test.
23) *#*#232338#*#* = Shows WiFi MAC address.
24) *#*#1472365#*#* = GPS test.
25) *#*#232331#*#* = Bluetooth test.
26) *#*#232337#*# = Shows Bluetooth device address.
27) *#*#8255#*#* = Launch GTalk Service Monitor.
28) *#*#4986*2650468#*#* = PDA, Phone, H/W, RFCallDate.
29) *#*#1234#*#* = PDA and Phone.
30) *#*#1111#*#* = FTA SW Version.
31) *#*#2222#*#* = FTA HW Version.
32) *#*#44336#*#* = PDA, Phone, CSC, Build Time, Changelist number.
33) *#*#0283#*#* = Packet Loopback.
34) *#*#0*#*#* = LCD test.
35) *#*#0842#*#* = Device test Vibration test and BackLight test.
36) *#*#2663#*#* = Touch screen version.
37) *#*#2664#*#* = Touch screen test.
38) *#*#0588#*#* = Proximity sensor test.
39) *#*#3264#*#* – RAM version.

Unverified code of HTC mobile phone:

1) ##37872# = Full Speed USB Mode – Enable/Disable.
2) ##3386# = DDTM – Enable/Disable.
3) *#0011# = Service menu.
4) *#0228# = Battery Status.
5) *#2454# = Low Battery Power Off.
6) *#0283# = Receiver Packet loopback.
7) *#0782# = RTCTimeRead displays time and seconds.
8) *#147852# = Allows you to access many screens including CDMA DATA Connections.
9) *#369852# = Allows you to access many screens including CDMA DATA Connections.
10) *#1472365# = GPS Setup.
11) *#232331# = Bluetooth RF Test Mode.
12) *#2664# = Touchscreen Firmware Version.
13) *#2664# = Main Firmware Update.
14) *#3264# = RAM Version.
15) *#3282*727336*# = Current Data State.
16) *#7450# = Phone Dump Mode Disable.
17) *#7451# = Phone Dump Mode Enable.

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