Originally Posted by
Riverwalk
Retractable USB cables probably don't include the connections and conductors for USB power. Removing a few conductors is likely what makes the cable thin enough to retract.
Depends on the phone/cables. I have a retractable Treo/USB sync'n'charge cable (although I don't like it and use a short regular cable).
But in general, regardless of phone, unless the retractable is advertised as a
charging cable, it's probably not.