You can trigger special screen effects in your iPhone text messages by typing these secret keywords. Here's the list.
Secret keywords for sending iPhone text messages with screen effects
Siri Tip of the Day: What’s my Elevation
Get your elevation by asking Siri. This works on iPhones from the iPhone 6 and newer.
Which model of iPhone do I have?
Some iPhone models look a lot alike! In iOS 12 you can find out exactly which one you have, right down to Apple's part number.
Siri Tip of the Day: Translate
Use Siri to translate from nine foreign languages into English. See the translation, and hear it also. It's as easy as "How do you say..."
Siri Tip of the Day: Add item to Reminders
Add an item to any list in Reminders just by asking Siri. If the list doesn't exist, Siri will offer to make the list for you. Super handy.
Scan QR Codes with the built-in Camera app
The iPhone's built-in Camera app can scan QR codes. No need to download a specialized app for that. For older systems, use the free Qrafter app.
Quickly scroll to the top of a list
Here's how you can quickly scroll back to the top of any list or content on your iPhone.
Siri Tip of the Day: Make it Louder
Siri can adjust the volume for you, hands-free. Just say "Hey Siri, turn it up" or "Hey Siri, make it softer."
Siri Tip of the Day: Built-in Cheat Sheet
Siri can do a lot of things and the list continues to grow. Find out what she can do by asking! Day "Hey Siri: what can you do?" and she'll give you a list.
Siri Tip of the Day: Do Math
Siri is good at math. Simply put your math question into words and she will solve it. Yes, this is "Word Problems." You probably thought you were through with them.