Code offer

Hello, some years ago I have developed a working SIM card emulator for Silver Wafer Card (PIC16F877 and 24LC256). It supports GSM 11.11 and GSM 11.14 standards and is fully functional inside cell phone (so far I have been using it for 10+ years). Unfortunately it is written in somewhat rusty PIC assembly -- still it might be usable for your purposes. I have published it on "https://github.com/vlp/ssim", so feel free to have a look. Best regards VLP