Clarification on iPhone 3G upgrades →
https://marco.org/2008/06/09/clarification-on-iphone-3g-upgrades
From Ars Technica:
AT&T spokesperson Brad Mays told us that […] the new 2-year contract replaces your previous contract. So, if you recently signed a 2-year contract (as I did, in January), you don’t have to commit to two more years for a total of four. You only have to sign a brand new 2-year contract.
That’s a relief.