I'll second this. I'd much rather use my VoIPo line than my cell phone when I'm not out and about, but it's impossible to get people to juggle two different numbers when they want to call or SMS you. They always just end up calling the mobile.

One possible work-around might be to sign up for Google Voice; I believe that service can forward SMS text messages. But it would be awesome if VoIPo could build in this feature.