[MBCook]

It’s not active yet, the speculation is roughly November. Knowing Apple they will be VERY clear about this when the time comes. Since you have to sign up for service (free for the first two years) that would be a good time to make you go through the limitations.

[ahepp]

Wait, do you need a subscription to send SOS messages? If that's true, it's an awful idea and is obviously going to result in tons of awful PR.