diff --git a/telephony/java/android/telephony/AccessNetworkUtils.java b/telephony/java/android/telephony/AccessNetworkUtils.java
index 6b82045..b5d97ab 100644
--- a/telephony/java/android/telephony/AccessNetworkUtils.java
+++ b/telephony/java/android/telephony/AccessNetworkUtils.java
@@ -567,6 +567,10 @@
      */
     public static int getFrequencyFromNrArfcn(int nrArfcn) {
 
+        if (nrArfcn == PhysicalChannelConfig.CHANNEL_NUMBER_UNKNOWN) {
+            return PhysicalChannelConfig.FREQUENCY_UNKNOWN;
+        }
+
         int globalKhz = 0;
         int rangeOffset = 0;
         int arfcnOffset = 0;
@@ -632,6 +636,10 @@
      */
     public static int getFrequencyFromUarfcn(int band, int uarfcn, boolean isUplink) {
 
+        if (uarfcn == PhysicalChannelConfig.CHANNEL_NUMBER_UNKNOWN) {
+            return PhysicalChannelConfig.FREQUENCY_UNKNOWN;
+        }
+
         int offsetKhz = 0;
         for (UtranBandArfcnFrequency uarfcnFrequency : AccessNetworkConstants.
                 UtranBandArfcnFrequency.values()) {
@@ -702,6 +710,10 @@
      */
     public static int getFrequencyFromArfcn(int band, int arfcn, boolean isUplink) {
 
+        if (arfcn == PhysicalChannelConfig.CHANNEL_NUMBER_UNKNOWN) {
+            return PhysicalChannelConfig.FREQUENCY_UNKNOWN;
+        }
+
         int uplinkFrequencyFirst = 0;
         int arfcnOffset = 0;
         int downlinkOffset = 0;
diff --git a/telephony/java/android/telephony/PhysicalChannelConfig.java b/telephony/java/android/telephony/PhysicalChannelConfig.java
index 8a4bb46..59eac6a 100644
--- a/telephony/java/android/telephony/PhysicalChannelConfig.java
+++ b/telephony/java/android/telephony/PhysicalChannelConfig.java
@@ -337,7 +337,8 @@
     private void setUplinkFrequency() {
         switch (mNetworkType){
             case TelephonyManager.NETWORK_TYPE_NR:
-                mUplinkFrequency = mDownlinkFrequency;
+                mUplinkFrequency = AccessNetworkUtils.getFrequencyFromNrArfcn(
+                        mUplinkChannelNumber);
                 break;
             case TelephonyManager.NETWORK_TYPE_LTE:
                 mUplinkFrequency = AccessNetworkUtils.getFrequencyFromEarfcn(