A service module is provided for use in a mobile communications system. The service module provides services to a calling user such as an answering service comprising several individual mailboxes. In various situations, the service module can automatically forward an incoming call to the desired mailbox by using an identification code to allow the user to retrieve or deposit messages. In other situations, the service module is responsive to an indicator during the call by which the user can indicate that the service module did not receive a correct identification code and is therefore required to prompt the user to enter the correct identification code. In other situations, the service module is responsive to an indicator during the call by which the user can indicate whether he/she desires to retrieve a message from his/her mailbox or to deposit a message in another user's mailbox.