Really clear the history on your IPhone
The following with the the history from your Iphone as well as clear the auto complete on the url drop down and search box. 1) Go to Settings --> Safari 2) Change your search engine (switch from Google to Yahoo! or vice versa) 3) Tap Home button 4) Tap Safari 5) Go to Settings --> Safari 6) Tap the following sequentially: Clear History, Clear Cookies, Clear Cache 7) Change your search engine back to what it was originally 8) Tap Home button 9) Launch Safari and verify search history is gone