I could not find this in search so I thought I would post it. I see the threads about this subject but thought I would post it for those who have not seen it yet. Sorry for the repeat. Montana's ATT towers are almost all 3g now.
I will miss turning on my heater......
CARWINGS® requires compatible 2G GSM/GPRS cellular network provided by AT&T. 2G cellular network not available in all areas and/or available at all times. Cellular technology is evolving, and changes to cellular networks provided by independent companies are not within Nissan's control. AT&T has announced that on December 31, 2016, AT&T will terminate 2G network availability. Like other devices that rely on 2G network coverage, once the 2G network is terminated, CARWINGS will not function unless equipment replacements, upgrades, or alternative 2G network coverage are available at that time, which Nissan cannot guarantee. Nissan not responsible for associated costs that may be required for continued CARWINGS operation due to cellular network termination (including equipment upgrades, if available, or roaming charges on alternative networks
edit: merged yet again