Dev Team Making Good Progress In Unlocking iPhone 4

News | Tuesday July 6 2010 2:59 PM | Comments (0) Tags: , , , , ,

The ‘baseband’ is the generic nickname given to the internal components of the iPhone that handle the phone calls and Internet access. This ‘baseband’ is a tiny and unique independent computer system that runs inside your iPhone , it is separate to the main system that handles the applications (such as email and google maps) and it talks to the main part of the phone over an internal communications network.
Think of it like a cable modem or other peripheral that is attached to your home PC that needs occasional updates. When a software update is released and presented to you within iTunes the baseband is sometimes updated (to fix bugs or add new features).
When iPhone 4 was launched, folks at
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.
We had reported that MuscleNerd and planetbeing of the iPhone Dev team were having fun playing around with iPhone 4 baseband to figure out how to unlock it. It looks like they’ve made good progress as MuscleNerd has just tweeted:
Good progress on iPhone 4 unlock with @planetbeing:
Next step is to keep the task backgrounded like we did for 3G/3GS Backgrounded task is the unlock.
As you can see in the screenshot below, they’ve managed to run arbitrary code on the iPhone ’s baseband and are a step closer to unlocking iPhone 4 baseband.
4 will be available.
As always, we’ll let you know as soon as we’ve any further updates. So stay tuned here at

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