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How do you change the pin code for unlocking iphone?

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Choose Settings > Phone > SIM PIN and turn the SIM PIN On. You will be prompted to enter the current PIN (iPhone ships with a default SIM PIN, please see the table below to determine what should be entered). You can then tap Change PIN to assign a different PIN number. Note that the SIM PIN is separate from the Passcode Lock (Settings > General > Passcode Lock) which comes up when waking from sleep and turning on.
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