Can I use unlocked AT&T iPhone 4s in Japan on AU KDDI??

Discussion in 'iPhone' started by NavyMustang, Jul 24, 2012.

  1. NavyMustang macrumors newbie

    Jul 24, 2012
    I'm in the military and moving to Japan in a couple of months. Does anyone know if I can use my unlocked AT&T iPhone in Japan with AU KDDI? I don't want to use softbank because I hear that their service is not as good. I also don't want to buy an new iPhone 4S, when the iPhone 5 is probably going to be coming out very soon. Will AU let me just get a sim card on contract with them? I'd be grateful for any info that I can get. THANKS!!!
  2. RocketRed macrumors 6502a

    Jan 25, 2012
    No you can't.

    AU uses CDMA (No Sim Card), the same technology that Sprint and Verizon uses.

    AT&T uses GSM (Sim Card), so you'll have to go with NTT Docomo or Softbank.

    I recommend NTT Docomo. They are the AT&T of Japan and have good coverage throughout Japan (City and Suburban)
  3. Dbyler1516 macrumors newbie

    Sep 26, 2012
    Not true, AU uses CDMA+GSM they have SIM cards but you must buy their phones. I have an AU iPhone with AU and the service is amazing. I also have a sim in my old iPhone 4S with them. My suggestion get the iphone5 I've been getting 16mbps download speed on their new LTE service on camp foster.

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