Developers can now start working with the software development kit (SDK) for version 1.6 of Google's mobile operating system Android, the company said in a blog post on Tuesday.

Android 1.6, known as Donut, adds support for CDMA (Code Division Multiple Access) and more screen resolutions plus other features. The first devices running Donut are expected in October, Google wrote.

The support for CDMA makes the potential market for Android based phones much bigger, especially in the U.S. Operators like Verizon can now add Android phones to their portfolio, according to Carolina Milanesi, research director at Gartner. Motorola is supposed to have a phone in the pipeline, she said.

One of the screen resolutions that Android version 1.6 will support is WVGA or up to about 850 × 480 pixels. That will allow for larger screens, which, for example, the user interface on the Motorola Cliq would have benefitted from, according to Milanesi. Currently, 320 x 480 pixels is the default resolution for Android phones.

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