I've not seen proof that Christina's voice was on anyone's phone.
We know EA's phone was used to call HF's phone (and text) at the three times mentioned.
Where is it spelled out that Christina's voice left a message on HF's phone while using EA's phone?
(She may have done so. Where is the proof?)
Also, HF "lost" his phone during the crucial hours Christina was trying to reach him during what we usually refer to as "a flurry of calls".
As I said earlier, we don't have details on which were calls or texts, or the content, at 3:50, 3:53, 3:55. But LE undoubtedly does.
LE would know if CM left a VM when she called from HF's phone and got no answer, and would know the content if she did.
I figure that she did, don't think it makes sense that she wouldn't have, but we the public don't have LE's forensic details on those calls.
We do know she was seen after those calls, on video, and nothing at that point seemed amiss.
In the affidavit, we are told EA says CM had used his phone for those contacts, and LE does not dispute that in the affidavit.
Taking all that together, I believe LE has proof that CM was the one who called HF, but no, we the public haven't been provided all of what LE has learned.