Using a foreign Nexus 4 in Japan

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http://forums.androidcentral.com – I will shortly be moving to Japan and at the same time I am thinking of replacing my old smartphone. I am very interested in the Nexus 4 but I am wondering whether to buy it unlocked in Sweden before I move or in Japan after I move there. I would like to buy it as soon as possible since my old phone is becoming increasingly unreliable. My questions are therefore: Would there be any problems using an unlocked foreign Nexus 4 in Japan? Could I get decent deals for just a SIM (with data traffic) in Japan? Or would buying the phone with SIM in Japan give me a better deal? I hope someone h (HowTos)