Source:
Endgadget MobileAT&T's Smart Limits parental control package has been temporarily taken offline after the carrier discovered a little catch-22 with the service: if a user of a Smart Limits-controlled phone dials 911 and gets disconnected, the emergency operator is blocked from calling back. Obviously, this is a case of Smart Limits being just a little too smart (or too dumb, depending on how you look at it) for the user's own good -- we don't think parents are too concerned about their young 'uns spending hours racking up anytime minutes on the line with a chatty 911 operator -- and AT&T clearly did the right thing by pulling the service until it gets sorted out. Shouldn't take too long, we imagine.
Read more:
http://www.engadgetmobile.com/
Various other references, mostly blogs.
There's a WSJ article backing this up, but it's subscriber only:
http://online.wsj.com/article/SB119058417177336615.html