Sigfox is company that sells Internet of Things network technology to mobile operators, but also owns and operates a network that uses their technology in countries like the US. Here is a Fortune article about Sigfox that covers their US based plans, but to date, very little has been seen of Sigfox in the actual US market. Update: This Lightreading article says that they are now in 100+ cities.
While many analysts that we speak with believe Sigfox will have trouble generating sufficient revenue with the pressures created by LTE-M1 and NB-IOT, they are certainly to be credited with creating the Low Power, Wide Area Networks market. Many companies, Link Labs included, have capitalized on the rapid growth in the market for using alternative ways to connect Internet of Things devices.
One of the most popular blog posts: Sigfox vs. LoRa
Another favorite: What is Sigfox?
Nick Hunn (an excellent blogger), wrote this piece on Sigfox, LoRa, LTE-M, etc. which we liked.
This is a deep dive into various aspects of Sigfox.