Apple  released long awaited iPhone OS 3.1 for iPhone 3GS and iPhone 3G along with iTunes 9 . We have seen the release of iPhone OS 3.0 on July which brought many new features to the device . The development of iPhone OS 3.1 was later announced to counter the unlock and jailbreak of iPhone 3G and iPhone 3G S with OS 3.0. Other than this iPhone OS 3.1 includes general system stability upgrades and bug fixes .iPod touch users can also avail OS 3.1 update for around 4.5 USD .  Like in the case of iPhone OS 3.0 here we have direct download links to iPhone OS 3.1 ipsw for iPhone 3G ,iPhone 2G and iPhone 3GS .

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