A phone that is “unlocked” is one that is not associated to a carrier. An unlocked phone will always have a place to put in a SIM card. If your phone does not accept a SIM card then it is not possible for the phone to be unlocked. As we do offer more money for phones that are “unlocked”, you can ask your carrier to unlock your phone for you and then submit it as an “unlocked” phone. Please note that iPhone 4 cannot be unlocked by Verizon. iPhone 4S and above can be. All AT&T phones can be unlocked. For other Sprint and Verizon phones, some phones can also be used on a GSM network. You would have to verify that with your carrier first to see if they can unlock the phone for you.