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.
AutoResponder can be configured under Settings -> AutoResponder and has an adjustable delay to prevent people who send multiple messages from getting rapid fire auto responses. The tweak saves your favorite auto replies so they can be easily selected before you enable automatic replies. Note this tweak will use your normal SMS carrier data plan or iMessage to send replies, it's not a free texting solution.
AutoResponder 2 is available on Cydia from the BigBoss repo for $1.50 (limited time sale). Check here for instructions on how to jailbreak iOS 6.x with evasi0n. You can also find out how to purchase and install Cydia tweaks with this guide.