Dialing a different number on Phone application
In many winmo device, touching the contact while in phone application opens up the contact details, allowing us to choose which telephone number to dial, to text, or sms. In HD however, touching the contact records dial the default telephone number. This number may not be the one that you wish to use.
In order to use a different number, slide the "m", "t" (etc) letter on the right hand side of the contact line. The top of the screen will show you the number.
In this way, you're able to choose the desired telephone number.