Recently, the team that originally wrote Siri (which was later bought by Apple) stated in an interview by David Pogue of Yahoo Tech, that there is a Siri trick that no one discovered.
This trick according to the team hasn’t been published or mentioned anywhere. They’ve started a new company called Viv.
How to do it
While replying to an email and you noticed it would be faster to wrap this up by phone, you just say to Siri, “call him” or “call her” and that’s it.
In addition, the email that you are replying to has to be associated with the phone number of the person saved in your iPhone. Siri knows who you mean and dial the person number straight from the Mail app.