So I get an email from Cox saying I've almost used up all my data. We recently bought a TCL Roku TV (roku is built-in) that has wifi. Will that device use data when turned off or I'm using the antenna? Our other tv has a roku device plugged in, will it use data when not in use? I realize it is Cox, so they may be jerking me to upgrade to unlimited, but I wanted to check first. Any ideas?