How-to: check your iPhone 4 upgrade eligibility
![](https://s.yimg.com/ny/api/res/1.2/sUcTtW0LHsdkh6933c8Prg--/YXBwaWQ9aGlnaGxhbmRlcjt3PTk2MDtoPTY1OA--/https://s.yimg.com/uu/api/res/1.2/rrq2MbPIYTQMvP4OOOnstw--~B/aD00MTE7dz02MDA7YXBwaWQ9eXRhY2h5b24-/https://www.blogcdn.com/www.engadget.com/media/2010/06/iphone-4-upgrade-text.jpg)
AT&T's made it pretty clear how this upgrade sitch is going to go down for existing customers moving to an iPhone 4 on the 24th of the month, but if you want to double-check and make sure you're good to go (we can't blame you), there's an easy way that was briefly mentioned yesterday: dial *639# on your current phone. You'll be returned a text message from AT&T detailing your situation -- either you'll be told you can get a full upgrade price (meaning $199 / $299 for the 16GB and 32GB, respectively) or you'll be eligible at some particular date in the future. Not all's lost in the latter case -- you can still pay $200 more for the phone as an "early upgrade," which is less than the no-commitment price of $599 / $699. We'll have a more comprehensive breakdown in our full iPhone 4 guide coming later today, so stay tuned!