I just checked, and I forgot that I had it set up. Now I need to check to see if it works, it’s been troublesome on past phones. But honestly, now that I have the phone set up to unlock with a fingerprint, having my phone locked just isn’t a problem now. It unlocks quickly.
IIRC Smart Lock depends on detecting your location, or a Bluetooth device. For location to work, I had to liberally add points all around my property in probably a 1/2 mile radius, that got the accuracy up to 90% or so but it was never perfect.
If you have a Bluetooth device in your house that tends to work more reliably with Smart Lock.
I’ve never understood why WiFi can’t be used for Smart Lock, I would assume the router has a unique MAC address that Smart Lock could recognize.
It unlocks when it detects the Bluetooth device that connects to my stereo. That’s my “trusted device.” Of course, Bluetooth has to be turned on (in the phone – it’s always on for the stereo), which it never is unless I’m listening to music.
Range isn’t a problem – I live in a not overly large NYC apartment.
How big is your house? How far are you from the trusted device? That may be the issue.