Step 5. Tap on the ‘Delete‘ option again from the confirmation window.
The conversation will now be deleted. Before you commit to deleting the conversation, make sure that you have read the entire conversation at least once. This is because the delete operation is permanent, and if you realize later that you had some important information exchanged in the deleted conversation, there is no way you can get it back on your own. The only solution then is to contact the particular contact and ask them for a screenshot of the conversation, if they still have it in their inbox.
