Is it safe to update iphone 4 to ios 5? I bought it from Apple Store UK but I live in Turkey. The phone is simfree. Is it possible that when I update it, it will be locked? If so how can I fix it?

People say that even the Iphone 4 is factory unlocked, when you update it to ios 5, it will be locked and there is no solution for that. I use ios 4.3.3 I hope you can help me. Thank you so much. Gizem.

If it is an officially unlocked iPhone, you can use any supported SIM.
Follow these steps to upgrade: iOS 5: Updating your device to iOS 5

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