Megaaadi, first step: you've to have an Sprint account so that you can activate the iPhone 4s in that account. After that, you've to call Sprint international support department and tell them that you're travelling abroad and needed to unlock the device. They'll verify the device esn if imei number and submit the unlock request to Apple. After that they'll tell you to wait for couple hours and restore the device but it takes just about 15 minutes. After you restore the device, It's good to go. Hope that helps. It's really not as difficult as you think.