No problem, just get a low-dropout 3.3V regulator and run that off the USB port. Then, it’s a simple enough matter of figuring out which pins are used to talk to the SIM card, and soldering them ...

Add in a hacked USB card reader, some careful cutting and assembly, and [gilmour509] has a very convincing floppy drive with gigabytes of space. The best part is that with everything put together ...

Plug-and-play USB with no-driver technology 2 PSAM cassettes (standard configuration), same size with 2 SIM cards in total Supports on-line upgrade Supports various card types (Mifare card, CPU, PSAM, ...