If you have an iPhone, there’s a good chance that you’ve used the “unread” flag to indicate that messages have not been read. But what if you want to mark messages as unread even though they have been read by someone else? There are a few ways to do this on an iPhone, but the most common is to use the “mark as unread” button in the Messages app. However, if you want to mark all of your messages as unread, you can also use the “unread all” option in the same app. Both of these options will mark all of your messages as unread in the Messages app, but they will not remove them from your phone’s memory. So if you want to keep track of which messages are still being stored on your phone, it’s best to use one or the other option rather than just marking them all as unread.
