First, one of the posters here mentioned that Jonah claims he called Rebecca at 12:30 am. However, Rebecca's cellphone record does not show him making that call.
Second, Someone accessed Rebecca's voicemail at 12:50 am, but this voicemail was deleted.
One speculation we can make from this timeline is as follows: Jonah never made a phone call at 12:30 am , thats why the voicemail was erased, otherwise , the voicemail contents will contradict his claim he made the call. Next, if Jonah did not make a 12:30 call , why did he particularly choose 12:30 as the time he claimed to make that call ? maybe , because he knew that someone accessed Rebecca's voicemail at 12:50 am. So who accessed Rebecca's voicemail at 12:50 am ?
The best way to put an end to the speculation above is to find a way to access the contents of that voicemail, and for Jonah to release his cellphone records. In addition, I wonder if he said for the record that he called from his cell or hospital line ? can the hospital line records also be accessed ?