BBM - Thanks for that, I hope it holds true in this case! I will have to look over the search warrants again to see if there was any served for any phone that could have possibly been a burner phone of KK's. I don't recall seeing that specifically but it's hard to remember it all. And I do see that in June 2018 the Supreme Court ruled on use of cell phones for tracking, location, etc and that there are certain circumstances that apply where there is no warrant needed.
And thanks, I do realize "all phones have phone numbers, and require cell towers to trasmit phone calls and texts." LOL