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.

For many projects, a WiFi connection is ... to explore the module itself, and [marcrbarker] shows some of the extra, unadvertised, features it has. Acting as a GSM module that can send and receive ...

A cut-out allows the cover to be conveniently removed and refitted without the need to disconnect the fluidic connections. In addition to the manual control interface, the Polar Bear Plus GSM™ can be ...