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So, here i am going to show you how to access the internal function of HTC Desire Touch screen android phones for testing the various hardware parts of your phone if it is working properly or not with the help of this secret code you can test LCD, vibration, camera, sensor (accelerometer, sensor, proximity sensor, magnetic sensor), touch screen, speaker, earphone, sub key, etc... if you have any hardware problem with your phone you can identify with this code if it is working or not to do this follow the steps below.

Step 1 : First of all open your keypad (where you dial the phone numbers)

Step 2 : Then dial the secret code *#*#3424#*#*
              This will open up a HTC Function Test Program as shown in figure ( you need to click accept to  proceed)


Then select the test you need to perform and press the Run key.
These codes will help you to check various hardware parts of your mobile if they are working fine or not.

Hidden Menu In HTC Desire 820

One more code that you can try on you HTC mobile phone is *#*#4636#*#*
By dialing this code on the mobile you can get information on phone, battery, wifi and some usage statistics like shown in the image below (just click the menu to explore)

There are plenty more of these to be found on the internet, these are just some of the best ones.

CAUTION: Dont mess unless you know what you are doing.