Whistle Phone Finder is not available for iPhone but there are a few alternatives with similar functionality. The best iPhone alternative is Find My, which is free. If that doesn't work for you, our users have ranked seven alternatives to Whistle Phone Finder, but unfortunately only two of them are available for iPhone. If you can't find an alternative you can try to filter for web or SaaS options.
The new Find My app combines Find My iPhone and Find My Friends into a single, easy-to-use app on iOS, iPadOS, and now macOS.* Find My can help you locate your devices and your friends and family. And now it can help you find your devices — even when they’re offline.