Now the iPhone can be your personal assistant, responding to messages automatically. This time we're not talking about Siri - it's AutoResponder 2 for iOS 6. This jailbreak tweak allows you to set an auto response to any incoming SMS text message or iMessage. To celebrate its launch, the tweak is currently on sale for half price on Cydia.
AutoResponder has a configurable whitelist that can ensure that specific contacts always get a personalized message. Everyone else will automatically receive the auto response message you choose to send while AutoResponder is enabled.