I originally purchased a Verizon S6 Edge. Don't care for it and am going back to my Note 4. I have a guy who wants to buy it but is asking me if it is "unlocked" and can be placed on an "international network". He is not talking about using it on Verizon's network but some other international network. Is it possible or does Verizon need to do something special. I am a novice with such things. Thanks.