OYBike

The OYBike System is a UK central London street-based rental station network that allows you to hire and return a bicycle via your mobile phone. OYBike operate a pay as you go system and charges start at 30p ($0.50c) for 15 minutes. With worries about public transport security, increasing inner-city congestion charges and increasing petrol prices - these types of services should see increased interest and usage.

the car equivalent in the US is Zipcar