How close does your phone need to be?
Can I walk around the house with my watch on and not carry my phone, yet still get the notifications and calls?
These phones cannot answer calls (you will have to wait for the upcoming LTE version next month), but they do have WiFi so you can walk around and still get notifications assuming you have a Wifi connection. It syncs the same Wifi networks that your phone has access to, so it is pretty seamless.