モデル番号の最初の文字の意味。
Step 4: If your Model number starts with the letter “M”, then it is a brand new device. If the Model number begins with the letter “F” then it is a refurbished device. And if your Model number starts with a letter “N” then it is a replacement device.
M: Brand new device
F: Refurbished device
N: Replacement device.
How To Check If Your iPhone Is Brand New Or Refurbished Model