Unlock SIM card
How do I unlock SIM card on my iPhone 8
iPhone 8, iOS 14
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If you're talking about the SIM card PIN code, contact your carrier and ask them.
If you're talking about a not supported SIM card, your iPhone might be locked to a specific carrier. Contact that carrier and ask them to unlock your iPhone, if you are eligible, as per this support article:--> How to unlock your iPhone for use with a different carrier - Apple Support
If you mean something different, please clearly specify your needs.
Regards
Giulio