Just thought I'd share my experiences with you all. Bought an HD2 about a year ago, to summarise it's been back to HTC six times as the in call audio quality was appalling eg overloaded, distorted, hissy, clicky and many other adjectives, in short - rubbish. Argued with HTC that although I was perfectly happy with it as a device it wasn't fit for purpose as a Telephone which was the one thing it should have excelled at - Trading Standards + Phone Supplier + HTC = large circular conversation where Trading Standards proved to be toothless and HTC and the supplier said they couldn't do anything and I was stuck with it. Upshot of this was about to chuck it on Ebay but decided to install Android 2.2 instead. Revelation! Not only is the OS superb and a joy to use but the installation has cured all the audio problems. So I've gone from a phone I nearly chucked to something that's not only extremely useable but rather excellent. Only issue I have is the GPS doesn't seem to work. Does anyone have an idea? Thanks, Martin.