An unlocked iPhone typically commands a higher price than one restricted to a single network.
Technically, the IMEI is superior . Network locks are enforced via the cellular radio, and the IMEI is the identifier your carrier sees when you try to connect. However, the serial number is often easier to find. It is printed in large font on the back of the original box and inside the "Settings" app under "General" > "About." iphone carrier check by serial number
Once you run an iPhone carrier check using the serial number, you will see cryptic policy names. Here is how to decode them: An unlocked iPhone typically commands a higher price