Just curious if any of you use "Ok Google" ? I know it's been around for a long time, but I was always scared of the battery drain it would cause, so I never used it. But now I want to use my phone as a smartphone, I'd like to use it more hands free, just say Google, " call Mom ", or Google " text Tom; blah, blah, blah ", or Google "turn on WiFi" Does it work as well as advertised ? Does using your phone like this, make it better, and easier not having to hold it and type something, or press through the menu to make a phone call ? Is it a major battery drain ?