However, Apple actually does have a decent users manual, available for free download from the Apple support site. It's hard to find there, so use this link. The 152-page PDF document is clearly written and very comprehensive, with chapters on:
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Did You Know That iPhone 3G Has a User's Manual?
When you look inside the box from a new Apple iPhone 3G, you'll find a handset, a cleaning cloth, an AC adapter, a USB cable, ear buds, and a warranty document. What you won't find is an owner's manual. But there is one!