If you turn on your burner phone at home right next to you regular phone, your phone company knows it is you or someone close to you. They have to, it's how cell technology works.

If you want to make the burner phone work for privacy, you have to have two sets of faraday bags, one for your regular phone, on for the burner, and you have to drive a few miles with both in the bag before pulling one out of its bag.

And you never ever get to screw up.

Note: Amazon sells decent faraday bags.