Sprint Security Hole

I've often wondered about the security of all these automated phone systems that ask for user info. Now comes word that Sprint (my carrier, at the moment) has a hole in theirs. Apparently it is only in the system that verifes identity verification for international calling permissions. The hole? If you enter a cell number it will read back the customer's info asking to verify it. According to this report at BoingBoing, it doesn't report back all numbers, but hey, one is enough isn't it. Scary? Check out the some of the info that the caller got here.