I've tested a lot of wallet finders over the past year, and this is, without doubt, the best of the best. It's tougher than the others, the buzzer is super loud, the little glow-in-the-dark inserts ...
You'll first need to access your Intelligent Wi-Fi settings by opening your Settings app, tapping on the Connections tab, then Wi-Fi, then the three dots (for expanded settings) on the top-right ...