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With my iPhone 5, I've been finding that I keep having to unlock the SIM code every time I update the iOS from one minor release to the next. While this isn't a problem, as I've memorized the code, it is rather annoying.

Is there any way to change this behavior, so that I don't have to keep worrying about this?

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It is just the way it is :) the Update automatically locks the SIM, since that is the "normal" condition. Just imagine what would happen if updates would unlock the SIM without asking you! – Buscar웃 Jun 24 '13 at 21:20

Is this a 'SIM PIN'? If so, go to settings - phone - SIM PIN and turn it to off.

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