code: @Implementation(minSdk = N)
    protected SubscriptionInfo getActiveSubscriptionInfoForSimSlotIndex(int slotIndex) {
      if (subscriptionList == null) {
        return null;
      }
      for (SubscriptionInfo info : subscriptionList) {
        if (info.getSimSlotIndex() == slotIndex) {
          return info;
        }
      }
      return null;
    }
docs: Returns subscription that were set via {@link #setActiveSubscriptionInfoList} if it can find
  one with the specified slot index or null if none found.