The option to unsend is only available on iOS 16 and newer.
The recipient must also have iOS 16 and newer for undo send to work.
This feature is only available for iMessage displayed with blue bubbles.
Vlada Komar
If it is green, it is a message, and this feature is not available.
it’s possible for you to unsend it within 2 minutes.
After that, the option to unsend disappears.
What are the reasons you cant unsend messages on iPhone?
It works the same way in iOS 17.
So, if your iOS is older, you cannot unsend or edit iMessage.
it’s crucial that you have iOS 16 or newer installed on both contacts iPhones.
The undo send option only works for iMessage.
In the chat, iMessage is displayed in blue bubbles.
If you see a message displayed in a green bubble, you cannot undo it.
you’re free to unsend an iMessage within 2 minutes.
After 2 minutes have elapsed since sending, the unsend option will not be available.
However, you might edit the message within 15 minutes after sending it.
Sometimes, there may be some malfunctions.
To fix this, you could restart the Message app or re-activate the iMessages option in the tweaks.
In order for iMessages to reset its function.
How to fix unsend messages not working on iPhone?
It is important to allow your iPhone to use this for iMessage.