Call a Bike

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Call a Bike is a bike hire system run by Deutsche Bahn in several German cities, which uses a system of authentication codes to automatically lock and unlock bikes.

Standard design of bike, with electronic lock by rear wheel


To find the bikes one has to search at the cross roads in the central areas of the towns or use location-based services[1] on modern cell phones to find them.

To hire
Customer calls the telephone number given on the bike which includes the bike's ID and gets by voice the 4 digit opening code, which the customer then types onto the bike's touch screen to unlock it. They can also use the official Call a Bike app, available for iPhones and smartphones running Android, to locate a bike and receive the opening code.
To return
Lock the bike to a fixed object, and select "return bike" from the bike's touchscreen. A code will be generated which then has to be telephoned to the control centre, as proof that the bike was locked. As well one has to give the exact street names of the cross roads, which has to be within the permitted town area.
From 2013, in some cities, e.g. Cologne and Munich, this phone call to return a bike is no longer necessary, as the return location is now being transmitted to the control centre by GPS.
Lock temporarily
Similar to returning the bike, except that it doesn't generate a "return code"

The cost is 8 Euro cent per minute; holders of a BahnCard get a reduced rate of 6 cent per minute; there are also reduced rates for 24 hours or a week of use. In Stuttgart the first half hour of use is free. This fee is capped at €15/day.

DB provides local numbers for the phone calls from a cell phone which are required to both hire and return the bikes. Depending on your phone contract, the cost of your phone calls may exceed the price of the bike hire. However, if you are using a German SIM card which often has a flat rate for calling fixed line numbers, phone calls will be free of charge.


The system uses an electronic wheel lock and a cable lock, all controlled by embedded microcontroller with touchscreen LC display. A set of 1024 pregenerated lock/unlock codes are unique to each bike and stored in memory.[2]


Used in Aachen, Berlin, Bonn, Frankfurt, Cologne, Stuttgart, Munich, Karlsruhe, Saarbrücken and other cities. Most cities with ICE stops at railway stations will have at least one location of Call a Bike at the station.

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