Apple iPhone 13

Here's the story:
My mother died suddenly and she was a wild lady. She also was very forgetful. She always would lose her phones and end up buying new ones, then find the lost one and not return the one she bought. She did this with everything. I literally have an Iphone AIR, 15, this 13 and an SE (which was factory sealed). Anyway, she had this phone which I opened the box and found the phone inside, but when I powered it on it came to the initial welcome screen. She never used this thing. I don't think she ever powered it on. I set up an Apple ID so I could get into the phone and find the details/battery health. This is for all intents and purposes, essentially new. I enclosed a few pictures, and the model is the MMM63LL/A. I checked a bunch of providers and it says it's good to go at T-Mo/Mint/Cricket etc. It would only let me click unlocked US in the listing.

Going to make a memorial for her on my property under a pine tree with the $. Thanks guys.

7/5- ATT unlocked it