Unlock iPhone from carrier

The number you posted is the model number of the phone. It is not information about the carrier. You will need to contact Apple regarding the carrier. Since it is a used phone, if the prior owner did not remove their Apple ID and password, you will never be able to use it even if you know who the carrier is.

What does it say in settings, general, about, carrier? This is a user to user forum and Apple is not here. If necessary you can contact Apple to find out who the carrier is. Also, you say this is a used phone. Ask who you got the phone from as to which carrier they were using.