(Using the term "YOU" and in any person) Yes, if you had premeditated a killing, this would make sense, but not if an accident occurred and you packed up the phone with the other belongings. Or if you wanted it to look like an abduction, you might not do that, because then there is just "I assumed he was still asleep" to cover for why you would not be worried. You might want to give the largest possible window for him to have disappeared in, because what if you had narrowed it down to w one hour slot where he had to have disappeared, and it turned out there was a road repair crew at that time who saw nothing on the road at that time. (Boy, can I come up with the ideas....)