If you add someone to an iMessage group chat... Can they see all previous texts in the thread?

Hi there cvdls,

When you add someone to a group text message, they most likely will not be able to see past messages that were sent, only messages that are sent after they were added to the group text message.

The 'How to add someone to a group text message' section here walks you through how to do this as well if you need it: Add and remove people in group text messages on your iPhone or iPad

Take care!