A:AnswerLocked means it's the service is tied to a particular cell service such as AT&T, Verizon, etc. Unlocked means you can use any GSM enabled carrier such as AT&T and TMobile using a SIM card.
A:AnswerIf you activate it to use through a carrier, yes, you will need to have data plan for it. If you don't have it activated with a carrier, you can just use it like a Wi-Fi only model and won't need a data plan.
A:AnswerYes it does, as long as you have a activated data sim or connected to wifi, it will work. I use it for the maps and some gps based games all the time.
