How do I get my HTC Google phone to show contact's name instead of their number when they message or call me?

I don't remember phone numbers very well, so I would like the name of the contact to display instead of their phone number. What do I need to do to achieve that?|||You can contact the customer care of HTC





http://www.htc.com/europe/CA_Hotline.asp鈥?/a>





http://www.htc.com/europe/CS_Mail.aspx