I can set Cortana on my Laptop running Windows 10 Pro to respond when I say "Hey Cortana" and I don't even need to touch the Laptop to command something to Cortana. I can enable or disable this in settings. But for my Lumia 535 running Windows 10 build 14393.693, I neither can enable this nor I could find a setting for this.
Sometimes I put my phone under my bed and its very difficult to look for it to do something. So is there anyway that I can make Cortana to do something like texting or setting reminder without bothering to go to my phone, enter my PIN and then manually type the message?