In IOS 16, users can edit and cancel message sending in the messages app, but this also has a time limit Users can re edit messages, giving them the opportunity to fix annoying spelling mistakes or expand text as needed. They can also "undo sending" messages, thereby completely removing them from the chat.
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However, the text messages here only apply to messages sent through IMessage, that is, messages with a blue background. The SMS message with a green background is not applicable, which means that the message will remain the same when it is first sent.
However, there are several considerations for this new feature. First, they have strict time limits. You only have 15 minutes to edit or undo sending messages - you can't change them later.
Apple also pointed out that older versions of IOS would not respond to unsent requests. In these cases, recipients on older operating systems will be able to see messages even if they are deleted on the sender side. After discussing with apple, Appleinsider confirmed the time limit and the restrictions on the old version of IMessage and SMS recipients.