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You can't. Once it's gone there is no way of recalling it.
The only way would be to install a replacement SMS app which delayed sending for a bit, giving you the chance to change your mind before it actually sent. I don't know whether such a thing exists, but there's no reason someone couldn't write this. But once it's sent, there's nothing you can do.
If you realise that you don't want to send it before you press Send, Pugs has given the answer above.
Why would you want to talk about old phones? You didn't start of talking about them.
Apologies if that is how we sounded, but we did not know what device nor messaging app you were using.because it was not necessary until now.
i had to bring the oldphones to the conversation because when i asked if there's any way to cancel an outgoing message... everybody reacted like if i was talking about something out of this world.
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