Apple's iPhone does not have a specific feature for secret conversations. However, users can still have private conversations through various messaging apps that offer end-to-end encryption, such as Signal or WhatsApp. Additionally, iPhone users can use the 'Hide Alerts' function in iMessage to prevent notifications from appearing on the lock screen or in the notification center. But if you are worried that your children may hide the dark side of their lives from you and you will not notice something important in time, Parentaler can monitor text messages on an iPhone for you.