Easily Access Full-iPhone Search from Any Screen
To search your iPhone from any of the app screens you have setup, touch and pull down. The search window will appear and allow you to enter text and search across the phone or the Web.
If you’d rather not type, you can touch the microphone icon in the search bar (or touch the microphone icon on the keyboard) and speak the search terms. (Note: if you don’t see the microphone in the search bar, touch the “X” to delete the previous search.)
You can also access the same search by scrolling to the left of the Home screen.
This tip also works on the iPad in exactly the same way.