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Harald Welte laforge at osmocom.orgHi Mychaela, On Wed, Feb 03, 2021 at 11:01:19PM -0800, Mychaela Falconia wrote: > My ideal dream SIMs for running my own GSM/2G network (a network whose > sole purpose is to provide service to classic GSM/2G phones) would be > those that have only the classic SIM application, and NO USIM or ISIM. > And I would really like for USIM and ISIM to be truly-truly Not There, > rather than just hidden from EF_DIR. In theory, you should be able to remove the respective applications from most java based cards with the right credentials via SCP02. Did you try? > I am currently in negotiations with Grcard in China, who are telling > me that they can supply me with such SIMs, and at an affordable price > too, without a cost-prohibitive MOQ. sysmocom can certainly also provide such cards, should you have a related requirement. It requires creating a card profile without ADF.USIM + ADF.ISIM, which certainly can be done. I think the cards will still react to APDUs with CLA != 0xA0, but you would not have any ADF.USIM or ADF.ISIM present. One clear disadvantage of using SIM without USIM functionality even on a 2G radio network is that you can never use mutual authentication between network and phone (which is a pure protocol related aspect, so it could be implemented in any phone/baseband whose software can be modified - including FreeCalypso. Regards, Harald -- - Harald Welte <laforge at osmocom.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)