Here's a start:

- Make calls when dictated phone numbers.

Reason: "Hey Siri" and a pair of headphones is a great way to hands-free multi-task. However, when I: "Hey Siri, please call 520.555.5555", it says that no locations with that number can be found. It is called the iPhone, afterall...

- Speaking of which: CONTEXT.

In the above example fine, but I should be able to follow that up with: "Just call that number".