Snowden told everyone "how to go dark" by taking parts out of a cell phone, and then telling people to keep using it!
I'll say this: If your cell phone works after taking the parts out, you are as visible as the Goodyear Blimp. This is because the microphone still has to work, the transmitter still has to work, and the cell network will triangulate your position even if the GPS is disabled.
True "going dark" means you don't have a phone at all, no tablet, no laptop, no digital camera with WIFI, no car year 2005 or newer, and not even an Ipod. It means no bluetooth devices, no smart TV, no desktop computer, no smart appliances and no smart meter. Going dark means you can't even have a decent radio in your older than 2005 car. Going dark means you convinced all your friends to ditch everything I mentioned, or you won't talk to them. And if anyone tells you you can go dark without ditching everything I mentioned here, they are BUNK.
--MEXICAN ANONYMOUS