Here are some details, basically you lock/unlock with your phone by calling a given phone number: http://www.callabike-interaktiv.de/index.php?id=401&&f=500 htt

Here are some details, basically you lock/unlock with your phone by calling a given phone number: http://www.callabike-interaktiv.de/index.php?id=401&&f=500 http://www.callabike-interaktiv.de/index.php?id=401&&#38... The bike lock is controlled from a central point. Also, as they have a GPS, they also propose an iPhone/Android application which can give you the nearest free bikes around you. This system is running in several cities in Germany.