Holder for securely attaching a smartphone to the handlebar of a bicycle or eBike. Adapts: simple and customised adjustment to the device thanks to the movable clamp mount. Optimum alignment: the device can be rotated 360° thanks to the ball joint and the angle of inclination can be adjusted, perfect for portrait or landscape format. Easy mounting on the handlebar thanks to individually adjustable rubber band. Suitable for any smartphone with or without a case or protective cover. The bike mobile phone holder is compatible with smartphones with a width of 5 - 9 cm. The holder can be mounted on handlebars with a maximum diameter of 3 cm. Simple locking by pushing the clamp holder together, the fixation is released at the push of a button. In addition to the clamp mount, rubber straps ensure a secure hold for the smartphone. Rubberised contact surfaces protect the smartphone from knocks and scratches. Full access to all phone buttons and inputs, so the device can be operated without removing it from the holder, e.g. also via Face ID or fingerprint sensor.