With AT&T being generous and bumping up eligibility for customers up to 6 months in advance to lock them into a new iPhone 4 (anyone with upgrade eligibility in 2010 will see that they are eligible to get a new iPhone by launch on June 24h) and a number of retail locations to acquire your coveted Apple smartphone purchases, how do you know if you’re eligible? You can dial *639# on your phone and AT&T will send you a free message to let you know.

(via: BGR)