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A list of changes and fixes in the iPhone 2.1 Firmware

There is a full list of changes and fixes in the new iPhone 2.1 firware on Apples site, which you can read here: http://www.apple.com/iphone/softwareupdate/ I've also included them below:
General Updates * Decrease in call set-up failures and dropped calls. * Significantly better battery life for most users. * Dramatically reduced time to backup to iTunes. * Improved email reliability, notably fetching email from POP and Exchange accounts. * Faster installation of 3rd party applications.