alenh2020 wrote:
Model number is MHDD3SE/A - A2221 where first letter M means it is new iPhone, not refurbished or replacement but in diagnostic software it says “unknown sales model” which is not good.
I looked it up, and it comes up as an iPhone 11, 64 GB in red. The last 4 corresponds to official distribution in Serbia, along with revision A (most Apple products are revision A). That is most definitely a gray market device. Whoever sold it to you was not an authorized reseller.
The first letter indicates that it was sold as new by Apple or an authorized reseller but wasn't refurbished or a replacement device according to Apple. But some devices are refurbished by third parties, and they can't access the means to modify the model number that Apple or its contract manufacturers have.