What is the different between full upgrade and early upgrade?

So AT&T said I qualify for a early upgrade on my iPhone now but I quality for a full iPhone upgrade in october. What is the difference?

Early upgrades don't offer the full price reduction for a new phone. Full upgrades offer a fully renewable contract and the less you have to pay for a phone.So, here.
Early Upgrade - A heavier price, but the same phone.
Full Upgrade - Full price reduction, same phone.

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