Applelover979 wrote:
It’s illegal iPhones like another’s normal iPhone? I don’t know if there is a seller who is not approved by Apple, so where do they get these products from? My phone is working fine but this information about the phone is worrying for me
Illegal is such a strong term. Most would call that gray market. For instance, I've known people who bought iPhones in the United States for use in India, China, or Brazil. That's not specifically illegal, but Apple doesn't specifically support them other than allowing access to iOS updates and access to the App Store. There seems to be a lot of demand for USA iPhones worldwide because they can be purchased unlocked and "SIM free" which isn't an option in many countries even where Apple directly sells.
There are some countries where Apple sells directly, but in many countries around the world it's only through a network of "Apple Authorized Resellers". There are also some countries where Apple only has distribution via wholesale distributors who choose who can sell.
Also - the model number on that sticker is incorrect. A new USA unlocked iPhone 12 Pro Pacific Blue should be model number MGLR3LL/A. But it would be sold directly from Apple at the retail level.
What country are you (and I assume the store) located in?