Hi again Sarah, if you are currently unable to use the ZTE F160 with a certain carrier, and it can only be used with one particular carrier, you can try contacting either the carrier or the store where the phone was bought from for info on how to unlock it. Hope this helps!

I think is to unlock the carrier restrictions.

Hello Sarah, when you say unlock, are you talking about the phone's screen lock or carrier restrictions that prevent it from being used with any other operator?