diff --git a/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java b/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
index 485eec8400..69471a1516 100644
--- a/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
+++ b/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
@@ -191,7 +191,7 @@ public class UpstreamNetworkMonitor {
      * check even tethering is not active yet.
      */
     public void stop() {
-        releaseMobileNetworkRequest();
+        setTryCell(false);
 
         releaseCallback(mListenAllCallback);
         mListenAllCallback = null;
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index c80ba8f9f2..af28dd794c 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -389,11 +389,6 @@ public class TetheringTest {
         StateMachine mUpstreamNetworkMonitorSM;
         ArrayList<IpServer> mIpv6CoordinatorNotifyList;
 
-        public void reset() {
-            mUpstreamNetworkMonitorSM = null;
-            mIpv6CoordinatorNotifyList = null;
-        }
-
         @Override
         public BpfCoordinator getBpfCoordinator(
                 BpfCoordinator.Dependencies deps) {
@@ -673,7 +668,6 @@ public class TetheringTest {
     }
 
     private Tethering makeTethering() {
-        mTetheringDependencies.reset();
         return new Tethering(mTetheringDependencies);
     }
 
@@ -1105,6 +1099,11 @@ public class TetheringTest {
         verify(mUpstreamNetworkMonitor, times(1)).setCurrentUpstream(upstreamState.network);
     }
 
+    private void verifyDisableTryCellWhenTetheringStop(InOrder inOrder) {
+        runStopUSBTethering();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
+    }
+
     private void upstreamSelectionTestCommon(final boolean automatic, InOrder inOrder,
             TestNetworkAgent mobile, TestNetworkAgent wifi) throws Exception {
         // Enable automatic upstream selection.
@@ -1128,6 +1127,7 @@ public class TetheringTest {
         wifi.fakeConnect();
         mCm.makeDefaultNetwork(wifi, BROADCAST_FIRST);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(wifi.networkId);
     }
 
@@ -1150,6 +1150,7 @@ public class TetheringTest {
 
         mCm.makeDefaultNetwork(wifi, BROADCAST_FIRST, doDispatchAll);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(wifi.networkId);
 
         mCm.makeDefaultNetwork(mobile, CALLBACKS_FIRST);
@@ -1158,6 +1159,7 @@ public class TetheringTest {
 
         mCm.makeDefaultNetwork(wifi, CALLBACKS_FIRST);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(wifi.networkId);
 
         mCm.makeDefaultNetwork(mobile, CALLBACKS_FIRST, doDispatchAll);
@@ -1176,6 +1178,7 @@ public class TetheringTest {
         mLooper.dispatchAll();
         mobile.fakeDisconnect();
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(true);
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(null);
 
         mobile = new TestNetworkAgent(mCm, buildMobile464xlatUpstreamState());
@@ -1193,6 +1196,7 @@ public class TetheringTest {
         mCm.makeDefaultNetwork(null, CALLBACKS_FIRST, doDispatchAll);
         mobile.fakeDisconnect();
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(true);
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(null);
 
         mobile = new TestNetworkAgent(mCm, buildMobileDualStackUpstreamState());
@@ -1208,6 +1212,8 @@ public class TetheringTest {
         mobile.fakeDisconnect();
         mobile.sendLinkProperties();
         mLooper.dispatchAll();
+
+        verifyDisableTryCellWhenTetheringStop(inOrder);
     }
 
     @Test
@@ -1230,6 +1236,10 @@ public class TetheringTest {
         mLooper.dispatchAll();
         mCm.makeDefaultNetwork(wifi, CALLBACKS_FIRST, null);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
+        inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(wifi.networkId);
+
+        verifyDisableTryCellWhenTetheringStop(inOrder);
     }
 
     @Test
@@ -1245,6 +1255,7 @@ public class TetheringTest {
         // automatic mode would request dun again and choose it as upstream.
         mCm.makeDefaultNetwork(mobile, CALLBACKS_FIRST);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(true);
         ArgumentCaptor<NetworkCallback> captor = ArgumentCaptor.forClass(NetworkCallback.class);
         inOrder.verify(mCm).requestNetwork(any(), eq(0), eq(TYPE_MOBILE_DUN), any(), any());
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(null);
@@ -1256,11 +1267,14 @@ public class TetheringTest {
         // Lose and regain upstream again.
         dun.fakeDisconnect(CALLBACKS_FIRST, doDispatchAll);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(true);
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(null);
         inOrder.verify(mCm, never()).unregisterNetworkCallback(any(NetworkCallback.class));
         dun.fakeConnect(CALLBACKS_FIRST, doDispatchAll);
         mLooper.dispatchAll();
         inOrder.verify(mUpstreamNetworkMonitor).setCurrentUpstream(dun.networkId);
+
+        verifyDisableTryCellWhenTetheringStop(inOrder);
     }
 
     @Test
@@ -1276,6 +1290,7 @@ public class TetheringTest {
         // list).
         mCm.makeDefaultNetwork(mobile, CALLBACKS_FIRST);
         mLooper.dispatchAll();
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
         inOrder.verify(mUpstreamNetworkMonitor, never()).setCurrentUpstream(any());
         // BUG: when wifi disconnect, the dun request would not be filed again because wifi is
         // no longer be default network which do not have CONNECTIVIY_ACTION broadcast.
@@ -1297,8 +1312,11 @@ public class TetheringTest {
         mLooper.dispatchAll();
         // BUG: dun has higher priority than wifi but tethering don't file dun request because
         // current upstream is wifi.
+        inOrder.verify(mUpstreamNetworkMonitor).setTryCell(false);
         inOrder.verify(mCm, never()).requestNetwork(any(), eq(0), eq(TYPE_MOBILE_DUN), any(),
                 any());
+
+        verifyDisableTryCellWhenTetheringStop(inOrder);
     }
 
     private void chooseDunUpstreamTestCommon(final boolean automatic, InOrder inOrder,