If you know this phones below codes than you know everything about this device, If you don't know like below codes than i think you don't know more about your device. Its working in must device of HTC mobile phones.
Check your Mobile phone's Information = *#*#7780#*#*
Check your Mobile Battery Information = *#*#7780#*#*
Check your Battery history Information = *#*#7780#*#*
Check or test your Mobile phone Bluetooth = *#*#232331#*#*
Check your Mobile phone Bluetooth device address = *#*#232337#*#
Check your Mobile phone's LCD Information use = *#*#0*#*#*
Check your Mobile phone's RAM Information = *#*#3264#*#*
Check your Mobile phone's Screen version Information = *#*#2663#*#*
Check your Mobile phone's Touch screen test Information = *#*#2664#*#*
Check your Mobile phone's proximity sensor test: Information = *#*#0588#*#*
Check your Mobile phone's Melody Test Information = *#*#0673#*#* OR *#*#0289#*#*
Check your Mobile phone's WiFi MAC address Information = *#*#232338#*#*
Check your Mobile phone's Test GPRS Information = *#*#1472365#*#*
Check your Mobile phone's Test Another GPRS Information = *#*#1575#*#*
Check your Mobile phone's PDA, Phone, H/W, RFCallDate Information = *#*#4986*2650468#*#*
Check your Mobile phone's PDA and Phone Information = *#*#1234#*#*
Check your Mobile phone's FTA SW Version Information = *#*#1111#*#*
Check your Mobile phone's FTA HW Version FTA HW Version: *#*#2222#*#*
Check your Mobile phone's full PDA, Phone, CSC, Build Time, Changelist number Information
*#*#44336#*#*
Check your Mobile phone's Packet Loopback Information = *#*#0283#*#*
Check your Mobile phone's test Vibration BackLight Information = *#*#0842#*#*
Check your Mobile phone's usage statistics Information = *#*#7780#*#*
