High Quality Content by WIKIPEDIA articles! W-SIM (Willcom-SIM) is a SIM card developed by Willcom which, in addition to standard SIM functions, also has the core components of a cellular telephone (PHS), such as the radio receiver/transmitter, built inside. It is currently used in some terminals (listed below), which do not have radio modules.The W-SIM core module is an extended version of a SIM card, containing not only user data but also all the transmission technology needed for a mobile device to work.

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