Hologram Nova
Connect the Pi to the world… includes Free SIM.
It ducked under our radar, but back in October 2017 Hologram launched the world’s first open source cellular radio, ideal for use with the Pi. It can communicate over 2G, 3G and various LTE networks. Hologram has its own data network which you can connect to from all over the world, with prices starting from $0.60/MB. Learn more at www.hologram.io/nova.