Does Chromecast increase data usage on cellular Wi-Fi?
I use a cellular carrier for my home Wi-Fi network. If I cast content already on my tablet, will this use any of my data allowance?
It uses whatever you have. It needs wifi, and essentially streams anything your streaming on your tablet. So, instead of your tablet streaming it, your chromecast is. If your streaming websites while using your tablet at the same time, then yes, that's double the data.