Assign relationship to your contacts using Siri. Once you get to use Siri a few times, it soon becomes second nature to call or text a contact in your address book.
Find my Friends is a useful app for ‘keeping track’ of your fellow iCloud and iPhone users.
If you would like to read through some recent emails from a contact. Ask Siri to find them for you.
This feature is particularly useful if you are out of the office and need to quickly schedule a meeting or event into your iCal calendar.
Facetime is a great video chat service available to iPhone and Mac users, made even greater when used with Siri.
The easiest way to send an email message to a contact in your address book.