What sort of messages are you talking about (I realise you can't reply, but this is the sort of thing we need to know to give the best answer)?
If you mean SMS, you can't cancel them. Once they are sent, they are sent.
Email recall is an Exchange feature, and only works for mail on the same Exchange server, so that doesn't apply to most, if any, mail sent from a phone.
If you mean some IM service, I doubt it, but it would be easier to answer if we knew which.