How to activate my sim card on a Unsupported Unlocked Samsung S21

Johndoe
Novice

How to activate my sim card on a Unsupported Unlocked Samsung S21,  I watched a lot of YouTube videos and some videos say to put it in a iPhone to activate it then put it in the S21 Others say to change the APN Settings Do I Do that with or without the sim card added to the S21 phone?

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