According to this article a device will soon be available that will allow people to charge their mobile phone whilst cycling. The phone manufacturer Nokia has designed the device which connects to a dynamo. It charges when the wheels turn and comes with a phone holder that straps to the handlebars. To charge the phone you would need to cycle at around four miles an hour. The faster you cycle the more charge your battery will get. Cycling at a speed of 10 miles an hour for 10 minutes would give about 28 minutes of talk time or 37 minutes on standby. The kit will be on sale by the end of the year.