However, Japanese CDMA2000-based phones are locked to the R-UIM they are associated with and thus, the cards are not interchangeable with other Japanese CDMA2000 handsets (though they may be inserted into GSM/WCDMA handsets for roaming purposes outside Japan).based devices originally did not use a removable card, and the service for these phones bound to a unique identifier contained in the handset itself. Japan's current and next generation cellular systems are based on W-CDMA (UMTS) and and all use SIM cards. In 1994, the name SIMEG was changed to SMG9. The Subscriber Identity Module Expert Group was a committee of specialists assembled by the European Telecommunications Standards Institute (ETSI) to draw up the specifications ( 11.11) for interfacing between smart cards and mobile telephones. The specification of the interface between the Mobile Equipment and the SIM is given in the STD-27 annex 4. Japan's 2G system (which was shut down in 2012 has already shut down PDC from March 31, 2010) also specifies a SIM, but this has never been implemented commercially.
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