- Nov 16, 2010
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Japan uses WCDMA almost exclusively. It is not one of the CDMA countries. WCDMA, also known as 3G GSM, is actually used for GSM carriers, not CDMA carriers. Although it is a Qualcomm technology but never used on CDMA carriers because it is incompatible.
KDDI has/had 1xRTT and CDMA2000/EVDO with SIM in Japan.