Along with the announcement of the iPhone 4 came news that AT&T was going to offer early upgrade options to existing customers. If you're wondering whether or not you qualify, you can dial *639# from your phone.
In the case of the iPhone, doing that eventually results in the text message you see below, which states:
As a valued customer, we can offer you an upgrade with a new 2-yr commitment and an $18 upgrade fee.
If you haven't been following the pricing of the iPhone 4, that gives me the option of the 16GB version for $199 or the 32GB version for $299. That's a nice savings considering without the subsidy I'd be paying $499 and $599 respectively.
I can honestly say that I don't need the new iPhone 4, especially since I'm more than happy with my iPhone 3GS and my HTC EVO. However, that has never stopped me before.
Will you be picking up an iPhone 4?
UPDATE: Commenter Denise pointed out that I had incorrectly stated that you could "text" to get the information. In fact, you dial. I have since updated the article.