The phone situation really doesn't bother me. My partner isn't supposed to use his personal phone, while he's working. Sometimes, he can text me back, other times, he can't. If it was an emergency, I would have to call his work and have them radio him.
My FIL carries a work phone and a personal phone. If the matter is serious, I might text or call him on his work phone, but it's supposed to only be used for work. Otherwise, all texts and calls would go to his personal phone and I would just wait for a response.
If I texted about coming home and heard no response within an hour, I'd assume it was a busy day and not expect a lunch visit.
As far as the husband immediately tracking the phone? It's not what I would think to do, first thing. But IF he works in IT, maybe it was one of the first things he thought of.
He came home and found the house empty, no wife, no kids. Sherri's car is in the driveway, so he would have to assume they're on foot somewhere.
Probably was completely unusual for his family to be anywhere, but in their home at 5:00-6:00 PM.
The situation would throw alarm bells up for me.