How to include a helper method in a controller

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.