Not him but I also leave my iPhone wide open. I primarily use it as a camera and tape recorder. And mobile wifi web browser with retina resolution in rare case

Not him but I also leave my iPhone wide open. I primarily use it as a camera and tape recorder. And mobile wifi web browser with retina resolution in rare cases, all in which I specifically avoid using it to use any sites that require logging in. I have a fake name on it. There are no contacts or email accounts set up on it. It's not ever been activated as a cell phone. Basically, I see no reason to have a password on it, and a password slows things down slightly and has the risk of forgetting (since I never reuse passwords), so why bother. My Android phone that I do use as a cell phone though I have a password on it. It has similarly few personal details, but the call logs would make it easy to identify me. Granted the iPhone's location logging though disabled might be storing info anyway, and probably the photos are GPS tagged, so those things would identify me.