Way to open mobile Sites on Computer/pc - Unblock Waptrick/wapkid

Many people try to open mobile sites on PC / computer but they fail to do so, because most of the mobile sites not work on PC like that of wapkid.com, but you can open and access theses sites by this trick. Generally most of sites shows different data on mobile, i pads and on tablets, they know about device just by user agent and you can change this agent to mobile agent after using this agent you can simply unblock the mobile sites.