In the messages app, you can favorite conversations with the contacts you message the most.
1.
From the Messages app, swipe from left to right on the message you would like to pin.
2.
Tap the Pin icon.
3.
To unpin a message, tap Edit.
4.
Tap Edit Pins.
5.
Tap the Minus icon beside the pinned message you would like to unpin.
You can also pin messages from this view.
6.
You've completed the steps!
