The finished version of the hack should be available by New Year's Eve, and will be the first software-based unlock for the iPhone 3G. Although the original 2G iPhone was unlocked within weeks, it has taken several months to achieve a 3G unlock, due in part to increased security measures from Apple. The blocks were meant to reduce the impact of a flourishing gray market; the proliferation of legal sales in dozens of countries may have reduced this threat, however, along with a switch from revenue sharing to a subsidy model.