Also - and I just found this out from adding a FAN to my new iPhone - the FAN % off ONLY applies to your minutes. You read that right. No discount on extended nights and weekends, text messaging, data plan, etc.
So since my FAN was 14% off of my $69 600 minute plan, that comes out to $9.66/mo savings which will take essentially 4 months to eat through the $36 they charge you to add the FAN.
Better than a poke in the eye with a sharp stick but they're still b@stards.