Yes, it’s quite amazing that they were able to get all sorts of data and information from the cellphone, excepting the date of the murder. How tragic that there was no data recorded that particular day! How did his phone know that he would die that day, so no records need be made? This is truly fortunate for the prosecution.
It has yet to be established that there was a murder. Zimmerman has been charged but not convicted. If he was acting in self-defense, he did not commit murder. Trayvon, on the other hand, appears to have been trying to kill Zimmerman. If he had succeeded, that would have been murder.