Although the iPhone is sleek and simple in design, it's software is anything but. The Safari Web browser that is standard on all iPhones not only displays Web content, but also keeps a record of all the searches you perform using the integrated search bar. If you do not want a record of your searches to remain on your phone, deleting your search history is very simple and will only take a few seconds.
Power on your iPhone and launch the Safari browser by touching the "Safari" icon on your phone.
Tap on the "Bookmarks" icon at the bottom right corner of the screen (the icon looks like an open book). Then touch "History" at the top of the screen.
Touch "Clear" at the bottom of the screen. A notification will appear asking if you want to "Clear History" or "Cancel." Press "Clear History." All your search history will be erased.