Searched this number and found zero hits.
My X was replaced by Apple Soho in June – maybe a new model, or replacement-only model number?
Trying to find compatible networks but this model number is foreign.
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Yuji Tomita 
My iPhoneX died suddenly when it’s 6 month old only. The symptom is that the charging function stopped suddenly and Apple technical said it’s dead after their diagnosis. Apple store replaced my IPhone as it’s still within warranty luckily. Checking my model, it’s the same model as yours. I was wondering why the model is different from regular IPhone X models as well…
These are Replacement model meaning likely refurbished. The first letter of the model number gives the indication of what it is. If it starts with:
F-means someone else/carrier refurbed it, M-means New, N-means apple replacement/refurb.
I just got a replacement with same model number. And mine was a verizon model is its unlocked. All verizon ones are unlocked.
You should really check the A1*** model number to see what it really is.