Billing for calls is important! If a client thinks they can call you up (or ask you to call them) without getting charged for it imagine how much time you'll spend on the phone - not getting any work done and not making any money!
I understand needing to set a rate for long distance but what about using Skype for that kind of thing? That way you know exactly how much the call cost (just take a balance reading)
I really like VirtualAdministration's idea of offering clients the chance to buy a number local to them, and Skype has numbers in many countries so that would work well if you had someone in Canada or the UK as well.
I bill for everything that takes my time to go toward a client's own business growth. That includes answering emails too, even if it's just brainstorming with a client. My 'smarts' are what they're paying me to have access to in the first place
Tami I'd be interested to know, since you have some experience in this area of billables and cost, how do you go about determining a fair rate for this kind of thing? Is it based on the actual cost plus time or...?