BlackBerry 10 phones will not have any type of physical navigational buttons. The user will solely have to rely on their knowledge of the UI swipe gestures that can invoke the appropriate action they desire.
Instead of “poking” UI components, users interact with content on the screen using gestures. Developers can avoid cluttering the screen with UI components and design applications to take advantage of the available gestures. For example, allowing users to zoom into a picture using the spread gesture instead of tapping a button to incrementally zoom in.
BlackBerry 10 devices support gestures from the device bezel (the frame around the display area of the screen). Here are the following swipe gestures possible in BlackBerry 10:
*NOTE* Additionally, you can swipe from bottom left corner and up to the right to bring up or down the keyboard with one hand.