alt Hacker NewsI found out today that the location header of an HTTP redirect can be a tel:+ URI and phone's will actually ask you whether you want to call that number.
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Aachen • today at 5:28 PM
Did you know that you can assign arbitrary programs (protocol handlers) to arbitrary protocols?
Links can have that as their href and it will also work as you'd expect. It's the telephone equivalent of the more well-known mailto: scheme