Phone won't come on.

[Wesley Whitaker]

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.

 

[mikedt]

Sounds like it's DOA. Suggest you return it as faulty, for replacement or refund

 

[ocnbrze]

are you holding the power button and not tapping it?

 

[Wesley Whitaker]

are you holding the power button and not tapping it?

Thanks! I was pushing and releasing it too soon, apparently. At least it's on now. I just plain forgot about having to hold the button in. (See, I told you I might not know how to turn it on.)
Thanks again,
Wes

 

[ocnbrze]

Thanks! I was pushing and releasing it too soon, apparently. At least it's on now. I just plain forgot about having to hold the button in. (See, I told you I might not know how to turn it on.)
Thanks again,
Wes

nice!!!!!!!!!!!!!! glad that worked.

 

[alexnik]

Hehe, sometimes at such moments you break a cold sweat, but nothing, as long as you try all the ways.