While the mobile operators prepare to roll out LTE-based NB-IoT for low power wide area (LPWA) M2M networks, the alternatives in unlicensed spectrum are building momentum while they still have the field to themselves. Sigfox, LoRa and other solutions in sub-1 GHz ISM spectrum are starting to move beyond one-off deployments to achieve real regional or even national scale, while Ingenu is plowing a lonelier furrow in 2.4 GHz. Sigfox has announced that it will expand its US roll-out tenfold, covering 100 cities by partnering with tower, rooftop, and billboard site owners, among them Outfront Media, which has 25,000 advertising sites, mainly in densely populated area. This and other deals give Sigfox access to 230,000 potential sites for its base…