You don’t need a phone at all to do this. Or code. Or silicon. Just a cheap RC oscillator circuit tuned to that frequency and connected to a battery and a tweeter speaker.
AliExpress bots have probably already read this comment and put together a ‘panic inducer top quality rechargeable usb frequency tweeter for wedding, birthday, sonic warfare, corporate and special event’ which you can buy for five dollars
You don’t need a phone at all to do this. Or code. Or silicon. Just a cheap RC oscillator circuit tuned to that frequency and connected to a battery and a tweeter speaker.
Edit: where’s RadioShack when you need it?
AliExpress bots have probably already read this comment and put together a ‘panic inducer top quality rechargeable usb frequency tweeter for wedding, birthday, sonic warfare, corporate and special event’ which you can buy for five dollars
Driven out of business by the CIA and FBI to prevent this from being easily doable no doubt!
(kidding, obviously lol)