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Time to think outside the box about battery consumption - if something is a problem - improve it - BT 2.1 is just that improvement for BT 2.0 - same transfer rate - but better battery consumption.
As far as CDMA, you can use the screen on the iPhone significantly more than the one on the Mogul - even if you turn off the wireless. CDMA may play a roll but that cleary isn't the case since if you turn wireless off it is more of an apples to a apples comparison although of course the iPhone has a much better screen.
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