Swipe right for Siri? Old news. Here are several iOS 9 features you might not have discovered yet or ones that you'll find surprisingly useful.
Phone Number Lookup
In iOS 9, your iPhone can pull data from the native Mail app to suggest who might be calling when an unknown call comes in. The same works for outgoing calls: the other day I dug around in my email to find a phone number for someone who wasn't in my Contacts, and later on noticed in the outgoing call log that the phone had correctly identified who the person was with a "Maybe" in front of her name.