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Our FreeCalypso family of projects currently offers the following physical hardware products for GSM/2G:

In addition to these physical hardware products, we also maintain a large body of published-source software related to GSM/2G: firmware for our TI Calypso chipset, host tools for working with various targets ranging from Calypso devices to SIM cards to USB-serial adapters, GSM speech codec libraries, our in-house extensions to Osmocom CNI software for deploying your own GSM networks, and so forth.