The industry standard of simply including a full-site link fails to support the user's mental state. When a user navigates around on the mobile site, they're giving a pretty clear indication of what they want to look at. Supporting the user's mental model, as they transition from mobile to full site, is more tedious, but crafting a good user experience always is.

Picture this. Sally is looking around on our mobile site because she wants to buy from us. She has actually taken time to surf down or search for the product she wants to see. However, due to the constraints of mobile, we made a few conscious choices to not put all the information there. We only included the high points that market research showed people really cared about. At this point, she might be a little bit frustrated as she taps on the full-site link to try to get more information. The full-site link was coded the traditional (lazy) way and took her to the root of the full site...