Factory unlocked phones are not attached to any carriers: this means you can choose the network provider you want and change it freely to another whenever you want. With a Factory unlocked phone you can insert the SIM card of any provider, even if you travel around the world, and the phone will work perfectly. Locked phones come with lots of APPS from the provider -generally useless- that only take up space. In your UNLOCKED phone, you decide how to use your memory! No agreement or contract to stick with, free yourself from worries, change your carrier anytime!