He decided to go with the low-cost SIM800L GSM modem, but as it only works on 2G networks, provisions have been made in the board design to swap it out for a more modern module should you desire.

The Open Electronics GSM/GPRS/GPS modem includes a header for an FTDI USB serial chip and a GSM module. Plug one into your computer and after a few short commands into a terminal, you’ve got a ...

Unlike radio modems, wireless modems support non-serial communications such as Ethernet, GSM, and GPRS. Ethernet, a popular protocol for local area networks (LANs), is similar to Global System for ...