Find My Phone
When the phone goes missing.
iPhone Find My
Free. icloud.com/find. Map shows phone. Play sound. Lock with passcode.
Android Find My Device
Free. android.com/find. Same options as iPhone.
Turn it on now
iPhone: Settings → your name → Find My. Android: Settings → Google → Find My Device.
Family sharing
Add family. See each other's phone location. Helps if grandkids lose their phone.
AirTag for keys
$29 each. Attach to keychain. Find with iPhone Find My app.
Tile / Chipolo
$25-$35. Same idea, works with Android too.
Quick Tip: Mark phone as lost — anyone who finds it sees a custom message and your callback number.