unlock iphone 4

Unlock for iPhone 4 is entirely a different story altogether. iPhone Dev Team released ultrasn0w 0.93 this past week which can unlock all basebands, including the newest 05.13.04on all iPhones (except iPhone 4). Before iPhone 4 was released, it was initially believed that this version of ultrasn0w will also be able to unlock iPhone 4. But iPhone 4 unlock will require complete rewrite of ultrasn0w software because of the new baseband OS in iPhone 4.

The DevTeam and others have been checking through the iPhone 4, and have noticed the baseband runs a completely different OS than on previous models. The iPhone 3G and 3G[S] both ran Nucleus OS on the PMB8878 baseband CPU(aka XGold 608), where the iPhone 2G ran the PMB8876 (aka S-Gold 2). iPhone 4 uses the PMB9800, or X-Gold 618 – running a separate OS – ThreadX, an RTOS by ExpressLogic.

So what this means is that an unlock for iPhone 4 wont be out anytime soon. So if you are an International user, you are good to go with unlocked versions of iPhone 4. US iPhone 4 users will have to wait for long before they can use this device on carriers other than AT&T.

As expected, the SIM-free, factory unlocked iPhones do not come cheap. UK customers can purchase the 16GB iPhone 4 for £499 while the 32GB model will cost them £599. These two models are available for €629 and €739 respectively in France. The 8GB iPhone 3GS model has been priced at £419 and €519 respectively in UK and France.

Despite the high price, factory unlocked iPhones can be highly popular among international travellers who may need to frequently switch carriers.