diff --git a/tests/tests/telephony/current/src/android/telephony/cts/TelephonyManagerTest.java b/tests/tests/telephony/current/src/android/telephony/cts/TelephonyManagerTest.java
index 7ec5f67..b95ccb0 100644
--- a/tests/tests/telephony/current/src/android/telephony/cts/TelephonyManagerTest.java
+++ b/tests/tests/telephony/current/src/android/telephony/cts/TelephonyManagerTest.java
@@ -68,6 +68,7 @@
 import android.telephony.CellInfo;
 import android.telephony.CellLocation;
 import android.telephony.DataThrottlingRequest;
+import android.telephony.ModemActivityInfo;
 import android.telephony.NetworkRegistrationInfo;
 import android.telephony.PhoneCapability;
 import android.telephony.PhoneStateListener;
@@ -114,6 +115,7 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.LinkedBlockingQueue;
@@ -3001,6 +3003,40 @@
     }
 
     @Test
+    public void testRequestModemActivityInfo() throws Exception {
+        if (!mPackageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)) {
+            return;
+        }
+
+        InstrumentationRegistry.getInstrumentation().getUiAutomation()
+                .adoptShellPermissionIdentity("android.permission.MODIFY_PHONE_STATE");
+        try {
+            // Get one instance of activity info and make sure it's valid
+            CompletableFuture<ModemActivityInfo> future1 = new CompletableFuture<>();
+            mTelephonyManager.requestModemActivityInfo(getContext().getMainExecutor(),
+                    future1::complete);
+            ModemActivityInfo activityInfo1 = future1.get(TOLERANCE, TimeUnit.MILLISECONDS);
+            assertNotNull(activityInfo1);
+            assertTrue("first activity info is" + activityInfo1, activityInfo1.isValid());
+
+            // Wait a bit, then get another instance to make sure that some info has accumulated
+            CompletableFuture<ModemActivityInfo> future2 = new CompletableFuture<>();
+            mTelephonyManager.requestModemActivityInfo(getContext().getMainExecutor(),
+                    future2::complete);
+            ModemActivityInfo activityInfo2 = future2.get(TOLERANCE, TimeUnit.MILLISECONDS);
+            assertNotNull(activityInfo2);
+            assertTrue("second activity info is" + activityInfo2, activityInfo2.isValid());
+
+            ModemActivityInfo diff = activityInfo1.getDelta(activityInfo2);
+            assertNotNull(diff);
+            assertTrue("diff is" + diff, diff.isValid() || diff.isEmpty());
+        } finally {
+            InstrumentationRegistry.getInstrumentation().getUiAutomation()
+                    .dropShellPermissionIdentity();
+        }
+    }
+
+    @Test
     public void testGetSupportedModemCount() {
         if (!mPackageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)) {
             return;