By checking the first character you can easily confirm the above situations.
M – This means that the device is a Brand new device, and was purchased new.
F – Refurbished means that the iPhone/ iPad / Apple products were restored to a fully working condition these devices were used before as display models or owned by someone before.
N – Replacement iPhone device, means that the original device was replaced by the other one due to a service request.
P – Personalized device with engraving, means that the iPhone/iPad was customized with an engraving on purchase.
3A – this means t