Early adopters always get pissed when a new device comes out. After all, it can be hard to justify spending another couple hundred bucks on a gadget that closely mimics your current gear. The iPhone is no exception, but luckily AT&T has your back (sort of – their network still blows).

AT&T is offering iPhone 4 upgrades up to six months early for a minimal upgrade fee of $18. That’s a damn fine price to get your hands on the new iPhone. If you’re like me, you probably cringed when you saw that six month figure. I got my 3GS last June on launch day, which leaves me a far cry from the six month upgrade window. As it turns out, that “six months” is a little more flexible than you’d think.

If you want to know your upgrade status, dial *639# from an AT&T phone and you’ll receive a text message concerning your eligibility status. I was pleasantly surprised to find that I was indeed eligible for the $18 upgrade. I’m definitely taking advantage – current 16GB 3GS prices range from $250-$500 on eBay. That more than covers the cost of the phone and the upgrade.

The iPhone 4 will be available June 24th.