If I down grade to iOS 3.1 and jailbreak my iphone will i still get OTA updates?

bmail21

New member
iOS 4 sucks on my iphone 3g, so i wanna jailbreak it and not get caught by AT&T... will i be able to get away with downgrading to os 3.1 and jailbreaking it? and not get OTA updates?
 
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