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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.^[1] 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.

• WS001IN / "TT"

  Hand-set terminal by Net Index.

• WS002IN / "DD"

  Data communication terminal by Net Index.

• WS003SH / W-ZERO3

  Hand-set terminal(smartphone) by Sharp.

• WS004SH / W-ZERO3

  Hand-set terminal(smartphone) by Sharp. Higher-spec version of WS003SH.

• WS005IN / nico.

  Hand-set terminal by Net Index.

• WS007SH / W-ZERO3 [es]

  Hand-set terminal(smartphone) by Sharp. Stylish and slender version of W-ZERO3.

• WS008HA / WS008HA

  ExpressCard data communication terminal by Hagiwara Sys-Com.

• WS009KE / 9(nine)

  Hand-set terminal by KES.

• Kids Ke-tai papipo!

  Hand-set terminal by Bandai. The internal code is WS006.

• Willcom Inc.'s page Archived 16 February 2006 at the Wayback Machine
• Engadget entry
• TT Phone
• DD "Data Driver" Archived 16 February 2007 at the Wayback Machine
• Sharp W-Zero3 PDA phone