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Phone won't come on.

Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black for AT&T (Renewed)
I bought this phone from Amazon. I inserted the simm card from an iphone 10, using AT&T. The simm card was the same size as the Androids- no problem inserting the card. The problem is that, even though the phone is now fully charged, I can't get it to do anything. Tapping has no effect. Pushing the buttons on the side of the phone- same thing- nothing. No welcome screen, nothing.
As you have probably figured out, all of this is completely new to me, so please respond as if I don't know for sure how to even turn an
Android phone on- because I may not.


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