I wanted to comment on that earlier. It was new to me that it had been turned off before her trip, because I was under the impression it was turned off after she found out she had a mess to clean up.
It amazes me why they just didn't get "throw away phones" from the beginning. Seems risky with phone data today. I mean that's how LE found KK in the first place. (But maybe again PF didn't think ahead).
IIRC, KK said she turned it off because her husband had access to her tracking information (on Google?) and she lied to him about where she was going.