A method for delivering messages in a telecommunications network where the first text-form message of the session N is delivered to the user of the service such that the sender address (the A number) is converted to correspond to the session number N and the session stage J, in stages 2-n of the session N, a text-form message is received from the user of the message service at the sender address defined in the message in the previous stage, and the session proceeds according to the contents of the message such that the sender address (the A number) is converted to correspond to the session number N and the new session stage J, and the next text-form message of session N is sent to the user of the message service.