1Contactwho they're chatting with
2Messages
Also add:

Tip: *bold*, _italic_ and ~strike~ work like in the real app. Tap a bubble in the preview to jump to it here. The ▶ button on a message sets where live playback starts.

3Phone lookstyle, time, battery
Phone
Theme
Clock

Date bubbles say "Today", "Yesterday" or a weekday based on the scene's today.

Chat background
4Playback on setfor filming on a real phone
How messages appear

Open this page on the phone the actor will hold, press Play. It goes full screen and looks like a real chat. Everything above the ▶ marker is already there; each tap brings the next message — theirs with "typing…", yours typed letter by letter into the box, then ✓ → ✓✓ → blue ✓✓. Hold a finger on the screen for Restart / Exit. Tip: on iPhone, "Add to Home Screen" first so Safari's bars disappear.