diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/MobileInputLogger.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/MobileInputLogger.kt
index d4b2dbf..2e54972 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/MobileInputLogger.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/MobileInputLogger.kt
@@ -53,6 +53,27 @@
         )
     }
 
+    fun logTopLevelServiceStateBroadcastEmergencyOnly(subId: Int, serviceState: ServiceState) {
+        buffer.log(
+            TAG,
+            LogLevel.INFO,
+            {
+                int1 = subId
+                bool1 = serviceState.isEmergencyOnly
+            },
+            { "ACTION_SERVICE_STATE for subId=$int1. ServiceState.isEmergencyOnly=$bool1" }
+        )
+    }
+
+    fun logTopLevelServiceStateBroadcastMissingExtras(subId: Int) {
+        buffer.log(
+            TAG,
+            LogLevel.INFO,
+            { int1 = subId },
+            { "ACTION_SERVICE_STATE for subId=$int1. Intent is missing extras. Ignoring" }
+        )
+    }
+
     fun logOnSignalStrengthsChanged(signalStrength: SignalStrength, subId: Int) {
         buffer.log(
             TAG,
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/model/ServiceStateModel.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/model/ServiceStateModel.kt
new file mode 100644
index 0000000..cce3eb0
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/model/ServiceStateModel.kt
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.statusbar.pipeline.mobile.data.model
+
+import android.telephony.ServiceState
+
+/**
+ * Simplified representation of a [ServiceState] for use in SystemUI. Add any fields that we need to
+ * extract from service state here for consumption downstream
+ */
+data class ServiceStateModel(val isEmergencyOnly: Boolean) {
+    companion object {
+        fun fromServiceState(serviceState: ServiceState): ServiceStateModel {
+            return ServiceStateModel(isEmergencyOnly = serviceState.isEmergencyOnly)
+        }
+    }
+}
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileConnectionsRepository.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileConnectionsRepository.kt
index 9471574..5ad8bf1 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileConnectionsRepository.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileConnectionsRepository.kt
@@ -21,6 +21,7 @@
 import com.android.settingslib.SignalIcon.MobileIconGroup
 import com.android.settingslib.mobile.MobileMappings
 import com.android.settingslib.mobile.MobileMappings.Config
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.StateFlow
@@ -92,6 +93,19 @@
     val defaultMobileIconGroup: Flow<MobileIconGroup>
 
     /**
+     * [deviceServiceState] is equivalent to the last [Intent.ACTION_SERVICE_STATE] broadcast with a
+     * subscriptionId of -1 (aka [SubscriptionManager.INVALID_SUBSCRIPTION_ID]).
+     *
+     * While each [MobileConnectionsRepository] listens for the service state of each subscription,
+     * there is potentially a service state associated with the device itself. This value can be
+     * used to calculate e.g., the emergency calling capability of the device (as opposed to the
+     * emergency calling capability of an individual mobile connection)
+     *
+     * Note: this is a [StateFlow] using an eager sharing strategy.
+     */
+    val deviceServiceState: StateFlow<ServiceStateModel?>
+
+    /**
      * If any active SIM on the device is in
      * [android.telephony.TelephonyManager.SIM_STATE_PIN_REQUIRED] or
      * [android.telephony.TelephonyManager.SIM_STATE_PUK_REQUIRED] or
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt
index 8a8e33e..b068152 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt
@@ -25,6 +25,7 @@
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.demomode.DemoMode
 import com.android.systemui.demomode.DemoModeController
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.demo.DemoMobileConnectionsRepository
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.prod.MobileConnectionsRepositoryImpl
@@ -151,6 +152,15 @@
     override val defaultMobileIconGroup: Flow<SignalIcon.MobileIconGroup> =
         activeRepo.flatMapLatest { it.defaultMobileIconGroup }
 
+    override val deviceServiceState: StateFlow<ServiceStateModel?> =
+        activeRepo
+            .flatMapLatest { it.deviceServiceState }
+            .stateIn(
+                scope,
+                SharingStarted.WhileSubscribed(),
+                realRepository.deviceServiceState.value
+            )
+
     override val isAnySimSecure: Flow<Boolean> = activeRepo.flatMapLatest { it.isAnySimSecure }
     override fun getIsAnySimSecure(): Boolean = activeRepo.value.getIsAnySimSecure()
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/demo/DemoMobileConnectionsRepository.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/demo/DemoMobileConnectionsRepository.kt
index 2b3c632..a944e91 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/demo/DemoMobileConnectionsRepository.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/demo/DemoMobileConnectionsRepository.kt
@@ -27,6 +27,7 @@
 import com.android.systemui.log.table.TableLogBufferFactory
 import com.android.systemui.statusbar.pipeline.mobile.data.model.ResolvedNetworkType
 import com.android.systemui.statusbar.pipeline.mobile.data.model.ResolvedNetworkType.DefaultNetworkType
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.MobileConnectionRepository
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.MobileConnectionsRepository
@@ -136,6 +137,9 @@
 
     override val defaultMobileIconGroup = flowOf(TelephonyIcons.THREE_G)
 
+    // TODO(b/339023069): demo command for device-based connectivity state
+    override val deviceServiceState: StateFlow<ServiceStateModel?> = MutableStateFlow(null)
+
     override val isAnySimSecure: Flow<Boolean> = flowOf(getIsAnySimSecure())
     override fun getIsAnySimSecure(): Boolean = false
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryImpl.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryImpl.kt
index 962b2229..1107165 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryImpl.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryImpl.kt
@@ -18,8 +18,10 @@
 
 import android.annotation.SuppressLint
 import android.content.Context
+import android.content.Intent
 import android.content.IntentFilter
 import android.telephony.CarrierConfigManager
+import android.telephony.ServiceState
 import android.telephony.SubscriptionInfo
 import android.telephony.SubscriptionManager
 import android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID
@@ -44,6 +46,7 @@
 import com.android.systemui.statusbar.pipeline.dagger.MobileSummaryLog
 import com.android.systemui.statusbar.pipeline.mobile.data.MobileInputLogger
 import com.android.systemui.statusbar.pipeline.mobile.data.model.NetworkNameModel
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.MobileConnectionsRepository
 import com.android.systemui.statusbar.pipeline.mobile.util.MobileMappingsProxy
@@ -63,6 +66,7 @@
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.filterNotNull
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.mapLatest
@@ -156,6 +160,35 @@
             }
             .flowOn(bgDispatcher)
 
+    /** Note that this flow is eager, so we don't miss any state */
+    override val deviceServiceState: StateFlow<ServiceStateModel?> =
+        broadcastDispatcher
+            .broadcastFlow(IntentFilter(Intent.ACTION_SERVICE_STATE)) { intent, _ ->
+                val subId =
+                    intent.getIntExtra(
+                        SubscriptionManager.EXTRA_SUBSCRIPTION_INDEX,
+                        INVALID_SUBSCRIPTION_ID
+                    )
+
+                val extras = intent.extras
+                if (extras == null) {
+                    logger.logTopLevelServiceStateBroadcastMissingExtras(subId)
+                    return@broadcastFlow null
+                }
+
+                val serviceState = ServiceState.newFromBundle(extras)
+                logger.logTopLevelServiceStateBroadcastEmergencyOnly(subId, serviceState)
+                if (subId == INVALID_SUBSCRIPTION_ID) {
+                    // Assume that -1 here is the device's service state. We don't care about
+                    // other ones.
+                    ServiceStateModel.fromServiceState(serviceState)
+                } else {
+                    null
+                }
+            }
+            .filterNotNull()
+            .stateIn(scope, SharingStarted.Eagerly, null)
+
     /**
      * State flow that emits the set of mobile data subscriptions, each represented by its own
      * [SubscriptionModel].
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractor.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractor.kt
index 91d7ca6..cc4d568 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractor.kt
@@ -111,6 +111,13 @@
     val isForceHidden: Flow<Boolean>
 
     /**
+     * True if the device-level service state (with -1 subscription id) reports emergency calls
+     * only. This value is only useful when there are no other subscriptions OR all existing
+     * subscriptions report that they are not in service.
+     */
+    val isDeviceInEmergencyCallsOnlyMode: Flow<Boolean>
+
+    /**
      * Vends out a [MobileIconInteractor] tracking the [MobileConnectionRepository] for the given
      * subId.
      */
@@ -377,6 +384,9 @@
             .map { it.contains(ConnectivitySlot.MOBILE) }
             .stateIn(scope, SharingStarted.WhileSubscribed(), false)
 
+    override val isDeviceInEmergencyCallsOnlyMode: Flow<Boolean> =
+        mobileConnectionsRepo.deviceServiceState.map { it?.isEmergencyOnly ?: false }
+
     /** Vends out new [MobileIconInteractor] for a particular subId */
     override fun getMobileConnectionInteractorForSubId(subId: Int): MobileIconInteractor =
         reuseCache[subId]?.get() ?: createMobileConnectionInteractorForSubId(subId)
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryTest.kt
index 5152d6b..f59bc2b 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/prod/MobileConnectionsRepositoryTest.kt
@@ -16,6 +16,7 @@
 
 package com.android.systemui.statusbar.pipeline.mobile.data.repository.prod
 
+import android.annotation.SuppressLint
 import android.content.Intent
 import android.net.ConnectivityManager
 import android.net.Network
@@ -26,8 +27,10 @@
 import android.net.NetworkCapabilities.TRANSPORT_WIFI
 import android.net.vcn.VcnTransportInfo
 import android.net.wifi.WifiInfo
+import android.os.Bundle
 import android.os.ParcelUuid
 import android.telephony.CarrierConfigManager
+import android.telephony.ServiceState
 import android.telephony.SubscriptionInfo
 import android.telephony.SubscriptionManager
 import android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID
@@ -50,6 +53,7 @@
 import com.android.systemui.log.table.TableLogBufferFactory
 import com.android.systemui.statusbar.pipeline.airplane.data.repository.FakeAirplaneModeRepository
 import com.android.systemui.statusbar.pipeline.mobile.data.MobileInputLogger
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.CarrierConfigRepository
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.MobileConnectionRepository
@@ -572,6 +576,51 @@
             assertThat(mobileRepo.getIsCarrierMerged()).isFalse()
         }
 
+    @SuppressLint("UnspecifiedRegisterReceiverFlag")
+    @Test
+    fun testDeviceServiceStateFromBroadcast_eagerlyWatchesBroadcast() =
+        testScope.runTest {
+            // Value starts out empty (null)
+            assertThat(underTest.deviceServiceState.value).isNull()
+
+            // WHEN an appropriate intent gets sent out
+            val intent = serviceStateIntent(subId = -1, emergencyOnly = false)
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                intent,
+            )
+            runCurrent()
+
+            // THEN the repo's state is updated
+            val expected = ServiceStateModel(isEmergencyOnly = false)
+            assertThat(underTest.deviceServiceState.value).isEqualTo(expected)
+        }
+
+    @Test
+    fun testDeviceServiceStateFromBroadcast_followsSubIdNegativeOne() =
+        testScope.runTest {
+            // device based state tracks -1
+            val intent = serviceStateIntent(subId = -1, emergencyOnly = false)
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                intent,
+            )
+            runCurrent()
+
+            val deviceBasedState = ServiceStateModel(isEmergencyOnly = false)
+            assertThat(underTest.deviceServiceState.value).isEqualTo(deviceBasedState)
+
+            // ... and ignores any other subId
+            val intent2 = serviceStateIntent(subId = 1, emergencyOnly = true)
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                intent2,
+            )
+            runCurrent()
+
+            assertThat(underTest.deviceServiceState.value).isEqualTo(deviceBasedState)
+        }
+
     @Test
     fun testConnectionCache_clearsInvalidSubscriptions() =
         testScope.runTest {
@@ -1402,5 +1451,24 @@
                 whenever(it.transportInfo).thenReturn(WIFI_INFO_ACTIVE)
                 whenever(it.hasCapability(NET_CAPABILITY_VALIDATED)).thenReturn(true)
             }
+
+        /**
+         * To properly mimic telephony manager, create a service state, and then turn it into an
+         * intent
+         */
+        private fun serviceStateIntent(
+            subId: Int,
+            emergencyOnly: Boolean = false,
+        ): Intent {
+            val serviceState = ServiceState().apply { isEmergencyOnly = emergencyOnly }
+
+            val bundle = Bundle()
+            serviceState.fillInNotifierBundle(bundle)
+
+            return Intent(Intent.ACTION_SERVICE_STATE).apply {
+                putExtras(bundle)
+                putExtra(SubscriptionManager.EXTRA_SUBSCRIPTION_INDEX, subId)
+            }
+        }
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractorTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractorTest.kt
index 0f9cbfa..58d9ee3 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractorTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/MobileIconsInteractorTest.kt
@@ -28,6 +28,7 @@
 import com.android.systemui.flags.FakeFeatureFlagsClassic
 import com.android.systemui.flags.Flags
 import com.android.systemui.log.table.TableLogBuffer
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.FakeMobileConnectionRepository
 import com.android.systemui.statusbar.pipeline.mobile.data.repository.FakeMobileConnectionsRepository
@@ -888,6 +889,22 @@
             assertThat(interactor1).isSameInstanceAs(interactor2)
         }
 
+    @Test
+    fun deviceBasedEmergencyMode_emergencyCallsOnly_followsDeviceServiceStateFromRepo() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.isDeviceInEmergencyCallsOnlyMode)
+
+            connectionsRepository.deviceServiceState.value =
+                ServiceStateModel(isEmergencyOnly = true)
+
+            assertThat(latest).isTrue()
+
+            connectionsRepository.deviceServiceState.value =
+                ServiceStateModel(isEmergencyOnly = false)
+
+            assertThat(latest).isFalse()
+        }
+
     /**
      * Convenience method for creating a pair of subscriptions to test the filteredSubscriptions
      * flow.
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/FakeMobileConnectionsRepository.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/FakeMobileConnectionsRepository.kt
index cce038f..8229575 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/FakeMobileConnectionsRepository.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/FakeMobileConnectionsRepository.kt
@@ -23,6 +23,7 @@
 import com.android.settingslib.mobile.MobileMappings
 import com.android.settingslib.mobile.TelephonyIcons
 import com.android.systemui.log.table.TableLogBuffer
+import com.android.systemui.statusbar.pipeline.mobile.data.model.ServiceStateModel
 import com.android.systemui.statusbar.pipeline.mobile.data.model.SubscriptionModel
 import com.android.systemui.statusbar.pipeline.mobile.util.FakeMobileMappingsProxy
 import com.android.systemui.statusbar.pipeline.mobile.util.MobileMappingsProxy
@@ -93,6 +94,8 @@
     private val _defaultMobileIconGroup = MutableStateFlow(DEFAULT_ICON)
     override val defaultMobileIconGroup = _defaultMobileIconGroup
 
+    override val deviceServiceState = MutableStateFlow<ServiceStateModel?>(null)
+
     override val isAnySimSecure = MutableStateFlow(false)
     override fun getIsAnySimSecure(): Boolean = isAnySimSecure.value
 
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/FakeMobileIconsInteractor.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/FakeMobileIconsInteractor.kt
index de6c87c2..3a4bf8e 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/FakeMobileIconsInteractor.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/statusbar/pipeline/mobile/domain/interactor/FakeMobileIconsInteractor.kt
@@ -81,6 +81,8 @@
 
     override val isForceHidden = MutableStateFlow(false)
 
+    override val isDeviceInEmergencyCallsOnlyMode = MutableStateFlow(false)
+
     /** Always returns a new fake interactor */
     override fun getMobileConnectionInteractorForSubId(subId: Int): FakeMobileIconInteractor {
         return FakeMobileIconInteractor(tableLogBuffer).also {