Ok, all caught up and still feel like I/We are at square one.
On AF's Father saying the text was not delivered:
AF had an iPhone. If her Dad also has an iPhone or was using an iPad or Mac they would have likely been talking over iMessage. iMessage, transmitted over data and not shown on cell records, show the delivery status of sent/received messages and will show "Delivered" if the message is received and can show "Read at [time]" if the receiver has read receipts turned on. This is likely how he determined the message was not delivered. The only reasons messages are not delivered: Their phone is off, is out of battery (off), or is out of cell range and/or (wifi).
On the taking of the bracelet and phone:
Phone: Taken to destroy evidence. If the family has put it in lost mode and the phone has been or is ever powered back on it will be pinged immediately and location will be sent to Apple servers.
Bracelet: Memento for the killer to remember his victim by, like a sick keepsake.
LE has released next to nothing in terms of information. Why? They have someone in mind? Why not release the video evidence? Why not tell us more about the DNA profile?
Is it possible AF was having an affair?
Thanks for input. Glad someone reading who has more cell phone knowledge than I have.
I just did a test with my iphone and my wife's iphone to clarify. After I powered down her phone, I sent her a text, and on my phone there were no notifications (there was no red 'not delivered' like I get when I am out of cell phone range). My phone did not say 'delivered' in grey letters however, until I turned her phone back on. So the real question to the father is, did his message to Allison say 'not delivered' in red, or did his text to her simply lack the grey lettered 'delivered' confirmation message?
IMO:
If Allison's father's imessage to her said 'not delivered', I would guess Allison's phone was broken at that point.
If his imessage was missing the 'delivered' confirmation in grey letters, then her phone was probably turned off.
Either way, it seems likely that her father expected his text to go through, and it did not, which is reasonable grounds for foul play, considering we have so little information to go on, and she clearly communicated with her family often, and possibly every day.
Now, regarding tracking a phone that has been turned off after the fact, ARMCHAIR DETECTIVE, do you know anything about that sort of thing? Clearly if the phone was broken it could not be tracked, but if just powered down, I imagine it COULD be possible.