hello im very new to rails but i "think" it should go in the mailings_helper instead of the phonenumber_helper
or there should be an application_helper which i think is universal
Thanks for your replies!
@ Sijo: The problem was resolved by adding "include PhonenumberHelper" in the controller, as you have suggested (I was sure I had done that before...)
@ bushfreakz: Any helpers in app/helpers are only available to views, by default. If you have "helper :all" in ApplicationController, all helpers in app/helpers are available to all *views* only.