These conventional user interfaces often result in complicated key sequences and menu hierarchies that must be memorized by the user. Some portable communication devices (e.g., mobile telephones, sometimes called mobile phones, cell phones, cellular telephones, and the like) have resorted to adding more pushbuttons, increasing the density of push buttons, overloading the functions of pushbuttons, or using complex menu systems to allow a user to access, store and manipulate data. This situation is unfortunate because the user interface is the gateway through which users receive not only content but also responses to user actions or behaviors, including user attempts to access a device's features, tools, and functions. This challenge is particular significant for handheld portable devices, which have much smaller screens than desktop or laptop computers.

BACKGROUNDĪs portable electronic devices become more compact, and the number of functions performed by a given device increase, it has become a significant challenge to design a user interface that allows users to easily interact with a multifunction device. The disclosed embodiments relate generally to electronic devices with touch screen displays, and more particularly, to electronic devices that apply heuristics to detected user gestures on a touch screen display to determine commands. All of these applications are incorporated by reference herein. 29/281,695, “Icons, Graphical User Interfaces, and Animated Graphical User Interfaces For a Display Screen or Portion Thereof,” filed Jun. 11/367,749, “Multi-Functional Hand-Held Device,” filed Mar. 60/658,777, “Multi-Functional Hand-Held Device,” filed Mar. 11/038,590, “Mode-Based Graphical User Interfaces For Touch Sensitive Input Devices” filed Jan. 10/903,964, “Gestures For Touch Sensitive Input Devices,” filed Jul. 10/643,256, “Movable Touch Pad With Added Functionality,” filed Aug. 10/722,948, “Touch Pad For Handheld Device,” filed Nov. 10/188,182, “Touch Pad For Handheld Device,” filed Jul. This application is related to the following applications: (1) U.S. All of these applications are incorporated by referenced herein in their entirety. 7, 2007 and 60/824,769, “Portable Multifunction Device,” filed Sep. 60/937,991, “Touch Screen Device, Method, and Graphical User Interface for Determining Commands by Applying Heuristics,” filed Jun. This application is a continuation of U.S.

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