analog sunset
n.— «Today is the day the federal government says cell phone companies can stop providing service to analog cellular users. It’s all part of the plan to improve coverage and service options through digital signals.…The industry calls the changeover “analog sunset.”» —“Analog cell phones switching off” by Ron Brown in Central Point KDRV-TV (Medford, Oregon) Feb. 18, 2008. (source: Double-Tongued Dictionary)