Hmm, I heard that you can only cast to your Chromecast if they are both connect to the same network, ie your home WiFi.

Problems is the Chromecast will be locked into 1 network on registration, ie the first time you connect.

Have not tried myself, its what I read from other forum.

Other sifu can elaborate.

You can,  but you need to reset the chromecast to use another WiFi.

U can't remember the steps,  you can Google it.