Abstract: In methods and a system for enabling temporary interaction between a user device of a passenger and an elevator or an elevator group provided for public use in a public space, a database is maintained that includes information on at least one elevator or elevator group available for public use. A user device sends a request message that includes validation information. The request message is validated by verifying that the unique identification of the elevator or elevator group in said validation information is among said at least one elevator or elevator group available for public and that geographical locations of the user device and the elevator or elevator group fulfill a predefined proximity criterion. If the request message is deemed valid, temporary access is granted to an elevator application running on the user device for entering at least one call for elevator service via an elevator call API.