3 of us on an AT&T plan went from $200 per month to <$60. No changes to service whatsoever, all unlimited. Nearly zero hassle, all done online in a matter of minutes. What a joy to log on to my AT&T account 24 hours later and see SERVICE CANCELLED, I'm now happily in the BYU Alumni plan family. Also, you don't have to be an alumnus, just someone you know has to be (just need a BYU Net ID) and then they can add unlimited lines under their account. Do it.
I hate AT&T stores and reps, and this made me feel pretty good.