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Release Date: May 20, 2010
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Launch Device: HTC Nexus One
Nexus line of Smartphones was introduced with the release of FroYo. Nexus devices were co-created by Google to deliver the utmost clean Android experience. In this iteration, USB tethering, Adobe Falsh support and mobile hotspot was added along with the facility of updating apps directly from Android Market (now Google Play) automatically. Camera features were enhanced by adding digital zoom, scene mode, color effect and macro effect.
In this iteration overall performance of the OS was improved by revamping UI and optimized hardware speed.
Froyo 2.2
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Release Date: December 6, 2010
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Launch Device: Samsung Nexus S
The second Nexus device brought next iteration of Android OS i.e. Android 2.3 Gingerbread again named after a sweet. The second Nexus device was manufactured by Samsung. In this iteration the major features which were added involved support for NFC, UI refinements for simplicity & speed, new keyboard for faster text input, internet calling and one-touch word selection & copy/paste.
Support for front facing cameras and sophisticated resolution screens were also established in addition to above mentioned enhancements.
GingerBread 2.3.x
Wikipedia
Wikipedia