How to add people to a text conversation on iPhone 14

what AI says

"You can add someone to an existing group text on an iPhone if the conversation already has three or more people, and everyone uses an Apple device (using iMessage). [1, 2]

How to Add Someone to an Existing Group Text

1. Open the Messages app on your iPhone.
2. 
   
3. Tap the group conversation where you want to add a new person.
4. 
   
5. Tap the group icons/names or the "i" (info) icon at the top of the screen.
6. 
   
7. Scroll down and tap Add Contact (or the plus + icon next to the members list).
8. Type the name, phone number, or email address of the person you want to add, or tap the plus + icon to pick from your contacts.
9. 
   
10. Tap Done or Add to confirm. [1, 2, 3, 4]

"

Add and remove people in group text messages on your iPhone or iPad - Apple Support

How to Add People to a Group Chat on iPhone (tutorial)

more

add people to a text conversation on iPhone - Google-