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The a1003 power adaptor has the firewire plug that fits into the wall wart and the other end fits neatly into my iphone. The output on the a1003 adaptor reads 12v 1-amp. Im not sure if the cable reduces this. If I remember the iphone 3G is 5v.
Anyway, I found a couple of the a1003 adaptors and thought I might leave one at work and one in the kitchen for easy access charging.
Thanks in advance!
iPhone OS 3.1.3