A:AnswerI have the unlocked phone... Originally bought t with intent to use on TMobile - but ended up going with Verizon instead. According to TMobile Agent, the phone would have worked with their Sim card. Haven't tried Sprint but I think it'll work fine with their Sim.
A:AnswerSamsung is the make. If you want a warranty, that is up to you to decide as the buyer. Do not buy the Korean model since Samsung is releasing a US version.
A:AnswerIf it unlock i would assume you can activated it any where you go. It will not have a international warranty unless there a best buy store there. Jyst make sure you buy a cover
A:AnswerMaple gold and deep sea blue are region exclusives. Gold is available in the UK and blue is available in Canada and Hong Kong, and on preorder in Germany.