As we have reported just a few days ago, if you’re an iPhone 3G / 3GS user who’s unlocked your iPhone using ultrasn0w, you’re advised not to update to the latest iPhone OS 3.1.1 (3.1) which was released earlier this week.

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As expected from the news we heard via the iPhone Dev Team’s blog last week, one of the team member MuscleNerd demonstrated live today their iPhone 3G unlock tool ‘yellowsn0w’. MuscleNerd first showed that his iPhone 3G was running AT&T, then after running the tool, his iPhone was able to recognise and get a signal through his T-Mobile sim.

[via iPhone Dev]

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