It depends on if the company that made them made them USB or Firewire.
Starting with the 3g Apple removed the extra connect that allowed for both firewire charging and USB charging. Now they charge via USB only. Some chargers still use the old firewire standard so they wont charge a 3g or 3gs but will charge the orginal V1 iPhone.
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3GS 32g, V1 16g iPhone Sold, iPods from Gen 3 - Classic, Apple TV
"Chuck Norris' iPod came with a real charger not just a usb cord."
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