HTC provides user manuals for its phones on its official website. Users can find the manuals of their HTC phones on the supporting webpage. However, as of 2015, the manual for HTC Desire is not yet available on the HTC United States website. Some other HTC websites that offer the manual of this model are HTC Australia, HTC India, HTC Singapore and the English site of HTC Hong Kong.
When you access the HTC official website, it may redirect you to the HTC United States site or a specific local site corresponding to your current position. To go to the HTC Australia website, for example, click on the globe icon at the bottom left corner, and choose "Australia" in the menu. From the HTC Australia main page, click on the Support section of the website. Type "Desire" in the search bar, and choose "HTC Desire" in the drop-down menu.
Either choose "User manual" option in the "Hardware and other" category, or move the pointer to the download icon in the upper right corner and choose "User manual" from the drop-down menu. Depending on your browser settings, the manual either appears in your browser or downloads to your hard drive in PDF format.