How do I turn off auto-retrieve on the stock text messaging app?

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http://forums.androidcentral.com – I'm hoping this thread will make my question more visible. I have searched and searched and I found how to turn off auto-retrieve in the settings for the stock android text messaging app. Only one problem: That option is missing from the settings on my phone. I'm assuming this was done intentionally for AT&T so I can't use a third-party free SMS app. I have an old plan with unlimited data that I obviously don't want to give up. The trouble is that I have my text messaging plan (200 texts) tied to it, so if I try to upgrade my text messaging I will lose my unlimited data. So I insta (HowTos)