21 million fewer phone subscribers out of 1.7 billion subscriptions. Only 1.4 billion people in China, and many too young to have own phones. Many second phones are work-related. No job, no need for second phone. 21 million to too high as an upper limit. 1-3 million infected as of 20 March, and 140,000 - 450,00 dead as of 20 March are reasonable estimates, based on available information (not including mil nets).
Who knows how may of the subscriptions that went dark, went dark as a result of insufficient "social credit"?
Either way - nuke china.