I tried this solution with iphone 3gs firmware 3.1.2 and got only 12 pages 1 page more. I tried getting the 13th page but cannot.
Also tried it with iphone firmware 2g firmware 3.0 and it crash! But after reboot, I got 12 pages. That is also the maximum I can get. If someone gets 13th page, do let me know how you did it as I tried the same steps mentioned and I only got 12 pages.