If you want to delete the unwanted messages and attachments in iMessages, then you should follow the below mentioned steps:
Step 1: Hit on message icon on your iPhone so to reveal all the conversion on your iPhone.
Step 2: After that delete iMessages messages and message attachments.
However to delete the entire conversation, you should hit on edit button on the top left and after that hit the little red circle in the left side for each conversation to enable the delete option on right.
Step 3: After that hit on delete option to delete the entire conversation.
If you want to delete of part of the conversation or iMessages attachment, then follow the below steps:
- Hit on the conversation.
- Tap More and then tap the little circle on the left so that you can check the message and iMessage attachments.
- Hit on trash bin to delete iMessages message along with attachments.