Yes, but I wonder, do many second-hand smartphones end up in poorer countries and then undercounted? AFAIK these stats typically are derived from traffic to cer

Yes, but I wonder, do many second-hand smartphones end up in poorer countries and then undercounted? AFAIK these stats typically are derived from traffic to certain websites or telemetry from certain apps (or Google Play?); looking just at English websites/apps would then significantly undercount.