There are two new features for iOS 16 that are eagerly awaited by iPhone users. One allows them to edit a sent iMessage even if the error in the message wasn’t discovered until after the post was already sent to the recipient. Also, complete messages can be unsent making them disappear from the inbox of the recipient’s iMessage app.
How an edited message should look on the iPhone
Those who have already installed an iOS 16 beta version on their Apple devices can edit and unsend iMessages simply by long-pressing a message in the app. However, these options are only available for 15 minutes after the message has been sent. After time expires, you can no longer edit or delete that message.
The first public beta of iOS 16 is expected to be released in July with the final stable version of the operating system set for a fall launch. Certain recipients of iMessage messages could find themselves on the receiving end of multiple posts. Keep in mind that the ability to unsend and edit messages will only be available to those having an iPhone-to-iPhone conversation. Once an Android phone is involved, those new features are no longer available to any members of an iMessage group.
Source: Phone Arena