Mouser Electronics already has in stock the new RF transceivers Atmel / Microchip ATA8820 SIGFOX ™ for operation with voltages from 1.9 to 3.6 V and a current consumption of only 32.7 mA. The product is indicated for IoT projects, meters, patient monitors, and home automation. See more at: http://www.mouser.com/new/atmel/atmel-ata8520-sigfox-transceivers/