“And what did the FBI do before Smart phones?”
Gee, I don’t know. How did we text before smart phones?
Interviewing is great. Start by interviewing the contacts, calls, texts, emails, voicemails, photos, downloads, saved and stored media on the sim card, and 10-15 other ideas that haven’t come to me yet.
I daresay a smartphone knows more about you than a spouse.
I fail to see the profit of investigating someone who was a known quantity by everyone who knew him, yet no one did anything to talk him to sanity.