The VZW IPhone 5 is unlocked out of the box. No need to call to unlock like the iPhone 4S. For voice/SMS it will work out of the box upon insertion of an activated SIM card worldwide. For data depending on the SIM card it can be automatic (there is a automated script on the card by the carrier) or manual (manual configuration of the APN settings). If you are not a techie and don't want to mess with APN settings by connecting to WiFi and using a certain website I suggest using voice/SMS only.