Walt Mossberg takes an early look at add-on hardware and software for the iPhone. While the iPhone uses the same hardware ports as the iPod, most add-ons will require buying new gear or adapters to make the old iPod gear work.
Two new wireless headsets aim to correct problems seen in previous products, filtering out background noise in cellphone conversations and bringing great sound quality for iPod use. The devices work well, but each one has drawbacks.
Edited by Walt and written by Katie Boehret, this is a guide to gadgets, web services and other consumer technologies.
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