This is a simple way to achieve one of the loudest whistles ever! Anyone can learn and it only requires a Sharpie permanent marker cap. WARNING: turn your speakers down because it could be very loud. Try it yourself, and you will find that the whistle is actually much louder in person than on video!
Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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