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There is no link via the pop port to charge the phone. Nokia's charge only via the power connection. Motorola's are different.
The Nokia way is better as you can therefore charge your phone and plug it into a connection at the same time. For example if you are working remotely, you would not want it charging from a laptop for example and draining the battery on the lap top.
Or using the headphones whilst charging in the car???
There is also: Nokia Charging Connectivity Cable CA-70
This connectivity cable lets you charge your compatible phone while transferring data to or from your PC. It is especially suitable for multimedia devices that use a lot of battery power when downloading large data files.