Use 3D Touch to quickly reply to a message. You can use this feature from the Lock Screen, Notification Panel, or on a notification popup at the top of your screen.
1.
From within the Contacts app, touch and hold a contact.
2.
Select a communication option.
The options you see will vary based on the details you've entered for an individual contact.
3.
You've completed the steps!
1.
From within the Contacts app, touch and hold a contact.