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Internet telephony

Developers can now add SIP-based internet telephony features to their applications. Android 2.3 includes a full SIP protocol stack and integrated call management services that let applications easily set up outgoing and incoming voice calls, without having to manage sessions, transport-level communication, or audio record or playback directly.
Support for the platform's SIP and internet calling features on specific devices is determined by their manufacturers and associated carriers.

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Applications that use native code can now receive and process input and sensor events directly in their native code, which dramatically improves efficiency and responsiveness.
Native libraries exposed by the platform let applications handle the same types of input events as those available through the framework. Applications can receive events from all supported sensor types and can enable/disable specific sensors and manage event delivery rate and queueing.

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Faster, more intuitive text input

The Android soft keyboard is redesigned and optimized for faster text input and editing. The keys themselves are reshaped and repositioned for improved targeting, making them easier to see and press accurately, even at high speeds. The keyboard also displays the current character and dictionary suggestions in a larger, more vivid style that is easier to read.

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UI refinements for simplicity and speed

The user interface is refined in many ways across the system, making it easier to learn, faster to use, and more power-efficient. A simplified visual theme of colors against black brings vividness and contrast to the notification bar, menus, and other parts of the UI. Changes in menus and settings make it easier for the user to navigate and control the features of the system and device.