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Return number of packets received across mobile networks since device boot. Counts packets across all mobile network interfaces, and always increases monotonically since device boot. Statistics are measured at the network layer, so they include both TCP and UDP usage.
Before NoType:android/os/Build$VERSION_CODES;Href=../../../reference/android/os/Build.VERSION_CODES.html#JELLY_BEAN_MR2, this may return TrafficStats.Unsupported on devices where statistics aren't available.