NOTE: This does not apply to iOS4. It works on all previous iOS versions as far as we know… iPad USERS: This does NOT work on an iPad. Remember: Fill 1st & last pages with apps; have at least one app on all other pages; put one of the last alphabet Apple app in the last spot on the last page (like Voice Memo or Youtube); force that app off by dragging another app to the page (easy to do with an app from your bottom row if you want); turn your device off; turn it back on. Do you have a new 2nd page with only one app on it? If so, you’ve done it! Judging from the iOS4′s ‘folders’ concept each with 12 apps, the max install base will be 2160 apps. Well, that translates to 135 pages of apps at 16 each for the iOS3.x using this technoque. I’ve just added page 57 (not all are full, but I’ve got ‘categories’ per page — sort of like folders — but with up to 16 rather than 12). Has anybody hit a limit? I’m on an old 8GB 2G original iPhone, mind you, running iOS3.1.3. Your results should be even better… WARNING: It has just been reported that upgrading to iTunes 9.2 or higher may cause you to loose all your added pages. See comments area for user experiences!!! BACKGROUND: In iOS 3 for the iPhone/iPad Touch, Apple has limited us to 11 pages for holding application icons. Apps added after all 11 pages have been filled up do not appear on the phone (even though they are installed on the phone). This tip from a listener to the “Today in iPhone” Podcast reveals a work around to … 
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Source:
http://iphone-or-android.com/iphone-apps/iphone-ipod-touch-app-pages-full-try-this-no-jailbreaking-required/