Hello! We appreciate your interest in our products. An unlocked smartphone is a phone that isn't tied to a specific carrier or contract. Therefore, you have the freedom to shop for the latest phones and plans as often — or as infrequently — as you like. Plus, they don't come preloaded with numerous carrier applications that take up space on your phone. And when it comes to international travel, unlocked phones can't be beaten. As far as pre-paid plans are concerns, we suggest you reach out to the carrier of your choice to see what pre-paid options they have for you. We hope this answers your question and helps you with your purchase decision. ^Rod