Looks like T-Mobile has brought out the big guns on unlimited with their family plan. It's now up to competitors to see whether they'll follow.
$150 a month gets two lines of unlimited service. Additional lines are...get this...a mere $50 a month more, about the same as you'd pay for an unlimited line with the likes of CricKet. The first two lines are effectively $75 a month, cheaper than you'd pay for a 1350 minute plan on a single line.
As with T-Mobile's individual unlimited plan, the family plan includes, in addition to unlimited calling to and from anyone at any time andwhere your phone will work, unlimited messaging of any type.
What's even crazier is that you don't even have to sign a contract to get this deal. You can now get both unlimited individual and family plans with T-Mobile's FlexPay service. I'm still trying to find out whether T-Mobile offers a SIM-only kit for FlexPay though...their phone prices with no contract are rather high...