Kit to build  a modem to do data connections with SIM900 or SIM928 breakout (not included), phone calls, or send sms. It allows to make point to point data call. Allows direct data connection with another modem or mobile phone with a modem, but without going through the web: connections are made directly to the GSM data channel. It connects to the computer via a USB interface FT782M (not included). The modem has a socket for a loudspeaker and a microphone with which establish voice communication.

This project comes in  kit . Some components have to be soldered to the included PCB.

Get a bundle with SIM900 breakout

Get a bundle with SIM928 breakout