From blog.grandcentral.com

# Vincent Says:
April 25th, 2007 at 3:07 pm

"thanks for the feedback. If we turn off the caller presentation, the first forwarding phone that answers will get the call. This means that if your cell is out of battery, it will pick up all your calls and you would never be able to take them from another phone. You would also lose usage of the central voicemail. We’re looking at alternate ways of doing this and as you mentioned, we’ll soon let you speak the command so you don’t have to fumble for your phone.
As for the SMS, it’s coming. thanks for your patience"

Vincent Paquet