Ever written a text message, clicked "send" - and then wished you hadn't?

Anyone who's ever sent an ill-advised message in anger - or drunkenness - is likely to see the appeal of a new app, Privates, which lets users recall a text or picture message before it's been opened by the recipient.

Users of the app simply have to tap the "Recall" and the message will be deleted from Privates server.

However, that'll only work up until the message has been opened - so if you're going to change your mind it's best to do so promptly.