The first 500 people to use this link will get a 2 month free trial of Skillshare premium: https://skl.sh/stevemould2 You can grab the white noise ringtone here: https://stevemould.com/white_noise_ringtone.mp3 OR, thanks to Musician Vahakn Matossian, you can use these lovely tones: https://drive.google.com/open?id=1VO5_DC8foNEHerITApTDdFuAsIUgGN1r The science of sound localization is really interesting. This video is specifically about interaural time difference and how mobile phone ringtones are badly designed for the way our brains detect sound direction. You can make you phone easier to find by changing the ringtone to white noise. Also, emergency vehicle sirens like ambulances are badly designed for the same reason. The Tom Scott video I mentioned about reversing trucks is here: https://www.youtube.com/watch?v=fa28lIGuxq8 How to set a custom ringtone on android: https://www.androidcentral.com/adding-custom-ringtones-and-sounds-your-android#own How to set a custom ringtone in iPhone: https://support.apple.com/en-gb/HT207955 How to set a custom ringtone on Windows Phone: ? Thanks to these amazing patrons on Patreon for supporting my channel: Glenn Watson Joël van der Loo The Great Tit sounds are from the British Library: https://www.bl.uk/collection-items/great-tit-parus-major-alarm-call Patreon: https://www.patreon.com/stevemould Twitter: http://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: http://mathsgear.co.uk/