Ive gotten in the habbit of calling up and claiming to be the account holder (my father), as it was so much easier. Obviously with his permission. As long as your voice is particularly boy-ish, you should be fine.
I think you are referring to Regional Homeline Pricing. This was only introduced recently so some customers will still be on the standard homeline price. You will need to call to query/change this as the website is not 100% accurate and you will need the account holder to do so.