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I 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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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

Now we should add a ?message= query string to be read out loud in the users voice.

Did you know that you can assign arbitrary programs (protocol handlers) to arbitrary protocols?

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