[pubutil]

You might benefit from a Tile. Put one on your keys and/or wallet, they locate bidirectionally via sound blasting (e.g. keys > phone, phone > keys). Or maybe Bluetooth beacons would work just as well?

Though if you’re in it for the fun factor then go for the wifi option!

[fuckyah]

Apple has find my phone. Problem solved

[giancarlostoro]

To be fair, Android does as well? Just typing "Android find my phone" into google produces a scary result.