So far, no a single I’ve oral to at AT&T has any thought WHY phones have been authorised for upgrades. There is a little algorithm that everybody accepts as viable.Â
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But….
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We have 2 iphones. A 3GS, that was purchased on 8/11/2009, and a 4 that was purchased 6/2010.Â
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The line that is authorised for the ascent is the Iphone 4 purchased on 6/2010.Â
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We were seeking at you do the $25-ish Radio Shack 3GS->4 upgrade, though no a single can figure out how this could happen.Â

