W-SIM

{{Short description|Combined SIM card and cellular phone developed by Willcom}}

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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.{{cite web | last=McNulty | first=Liam | title=A closer look at Willcom's W-SIM | website=Engadget | date=22 October 2005 | url=https://www.engadget.com/2005-10-21-a-closer-look-at-willcoms-w-sim.html | access-date=20 February 2024}} 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.

A terminal device developer can build a customized terminal without the design and development of a radio module, and users can change to a different radio module W-SIM without changing the terminal itself.

Similar to traditional handsets made by WILLCOM, W-SIM terminals can be used in Japan, including global roaming with Taiwan and Thailand. For Mainland China, China Netcom had W-SIMs available, though its PHS network is due to be phased out this year. In addition, a GSM version called the CM-G100 had been developed for use in other countries.