How to detect Samsung S10 5G is running on 5G network?

Question

Android Q added a new network type, NETWORK_TYPE_NR, for 5G, it is not available for Android Pie. Yet the just released Samsung S10 5G has fully supported 5G function, it ca

Answer 1

Couldn't add this as a comment, but as @Pavel Machala said, looking at the ServiceState class in the AOSP yields the following:

/**
 * Get the NR 5G status of the mobile data network.
 * @return the NR 5G status.
 * @hide
 */
public @NRStatus int getNrStatus() {
    final NetworkRegistrationState regState = getNetworkRegistrationState(
            NetworkRegistrationState.DOMAIN_PS, AccessNetworkConstants.TRANSPORT_TYPE_WWAN);
    if (regState == null) return NetworkRegistrationState.NR_STATUS_NONE;
    return regState.getNrStatus();
}