grandcentral is calling both parties in the call, so neither gets charged.

better yet, if you make a grand central web button, you can email it your friends and they can call you long distance for free. (the web button asks them for their phone number and calls them first, then you)

i have a cheap cell phone plan with unlimited incoming minutes but rather expensive outgoing minutes. since i'm at the computer all the time anyway, i put all my regular contacts in my grandcentral address book and use grandcentral for all my outgoing calls. since grandcentral is calling me, i only get incoming minutes.