I want to know if my iPhone is refurbished

The serial number does not determine whether the iPhone is new or refurbished. The model number does.

Here is how to Determine if iPhone is New, Refurbished, Replacement, or Personalized

1. Open the “Settings” app on the iPhone
2. Go to “General” and then go to “About”
3. Look for “Model” and then read the model identifier next to that text, it will look something like “MN572LL/A”, the first character will let you know if the device is new, refurbished, replacement, or personalized:

• M – Brand new device, meaning the device was purchased new
• F – Refurbished device, meaning the device has been through refurbishing process
• N – Replacement device, meaning the originally bought device was replaced by this model likely due to a service request
• P – Personalized device with engraving, meaning the device was customized with an engraving on purchase

Hope that helped.

Axel F.