Release

The iPhone 3GS was made available for pre-order on June 8 and released on June 19 in Canada, the United States, and six European countries, and on June 26 in Australia and the United Kingdom. Within the first weekend of its release, over one million iPhone 3GS's were sold. July and August 2009 saw the release of the iPhone 3GS internationally. After the iPhone 4 was announced, an 8 GB (Black only) iPhone 3GS was released which was made available at a reduced price.

[edit]Bootrom

iPhone 3GS models with new bootroms started appearing in mid-September 2009 which had blocked the "24k" exploit used in previous bootroms which were used mainly for 'jailbreak' purposes. This made devices with the new bootrom harder to 'jailbreak' although not impossible. This marked the first time Apple slightly modified their devices midway through its supposed cycle (usually a one year cycle).