IRobot's Ava is a phone activated robot. It seems like it's not much more than a mobile webcam:
"Well, why not create a robot buddy in the home that you can call and activate, and it can drive around the home and make sure that she’s not fallen down the stairs," Angle suggested. "Instead of having 10 sensors and a big brotherly surveillance, you put one sensor on a mobile platform, pay for the mobility and navigation, and get the same effect – but on a more on-demand, more social interaction model type of basis..."