How to rotate text messages

Refer to this article to learn how to rotate the screen on your iPhone or iPod touch, or get help if the feature doesn't work. --> Rotate the screen on your iPhone or iPod touch - Apple Support

- Make sure Portrait Orientation Lock is turned off.

- Some apps don't support rotation, so your screen might not rotate even if Portrait Orientation Lock isn't turned on.

What model phone are you using? What version of iOS? Have you tried restarting the phone?