why do you want the full page on a phone? It's awful and not at all optimized.
Have you gone into the IE settings to check desktop version is set as preferred?
once you've done that, FB has a 'desktop site' link somewhere on its mobile site. Try the options panel near the bottom or top.
If I want to use the desktop version of FB, I use Surfy. You can easily switch between desktop and mobile versions.
It works pretty well on the rare occasion that I need to use the desktop version. I would say Surfy is definitely worth the try if you haven't already. Surely gives IE a run for its money as being worthy of the default browser status.
Yeah...this happens to me as well. all this started after the Cyan update.
1: What "Squachy" has said above.
2: There is a little trick. Open IE. type www.facebook.com?m2w . It will open the full website. Enjoy!