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The phone can't be accessed before PIN code is entered, the only alternative method is to remove the SIM card entirely. I haven't found a key combination that works on this version of Android.
Enter SIM PIN screen on Android 6.0.1:
Why not enter the PIN to access the phone. Well, I don't think you can bypass that. If its your SIM, I would advise you contact your service provider and they would help.
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