hey is there a small/simple auto reply app that works with the original sms app on the iphone?

like you set it to on and when someone txts you they get this auto reply like "Im busy" or "Go away" lol

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iPhone 3GS - 3.0 T-Mobile
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That is a great application for everyone. This will really does not miss use time of people when they are busy and will also save time without any doubt. I need to get this one as soon as possible.