I heard a rumor that if take my iPhone 3G to an
store for a ($79?) battery replacement, they will give me a refurb iPhone 3GS. Is this true? 
I'm curious because my iPhone 3G is no longer responsive at all and I suspect it to be either the logic board or battery.
I've tried everything to get it to boot or respond. It worked when I went to bed, it wouldn't work when I woke up.
(I'm stuck with a $20 go-phone
until I decide what to do... I don't need an iPhone 4, I like the 3G/3GS design better.)

I'm curious because my iPhone 3G is no longer responsive at all and I suspect it to be either the logic board or battery.
(I'm stuck with a $20 go-phone