Methods, apparatus, and computer program products for dynamic generation of forms on devices such as mobile telephones. A device user enters a form descriptor code comprising a set of alphanumeric characters. A form generator applies stored mappings between the input characters and a set of electronic form components. This identifies required form components. The form generator dynamically generates an electronic form having the identified components, and displays the form on a display screen of the device. The device user completes the form and sends the completed form to a target data processing system. The dynamic generation of a form in response to a simple input code can be used to control the format of user-entered data, such that the data is validly formatted when received at the target.