diff --git a/Android.bp b/Android.bp
index de90412..36923ab 100644
--- a/Android.bp
+++ b/Android.bp
@@ -25,6 +25,7 @@
 
     srcs: [
         "src/**/*.java",
+        "src/**/*.kt",
         "src-bind/**/*.java",
     ],
 
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index e516a88..647ff5d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -633,6 +633,17 @@
             android:name="android.nfc.disable_beam_default"
             android:value="true"/>
 
+        <provider
+            android:name="com.android.contacts.sdn.SdnProvider"
+            android:authorities="@string/contacts_sdn_provider_authority"
+            android:enabled="true"
+            android:exported="true"
+            android:readPermission="android.permission.BIND_DIRECTORY_SEARCH">
+            <meta-data
+                android:name="android.content.ContactDirectory"
+                android:value="true" />
+        </provider>
+
     </application>
 
     <!-- Allows the contacts app to see the activities and services needed
diff --git a/res/values/donottranslate_config.xml b/res/values/donottranslate_config.xml
index 2dd0e73..c4c0152 100644
--- a/res/values/donottranslate_config.xml
+++ b/res/values/donottranslate_config.xml
@@ -28,6 +28,10 @@
 
     <!-- File Authority for AOSP Contacts files -->
     <string name="contacts_file_provider_authority">com.android.contacts.files</string>
+
+    <!-- SDN Authority for carrier SDN -->
+    <string name="contacts_sdn_provider_authority">com.android.contacts.sdn</string>
+
     <!-- Flag indicating whether Contacts app is allowed to import contacts -->
     <bool name="config_allow_import_from_vcf_file">true</bool>
 
diff --git a/res/values/strings.xml b/res/values/strings.xml
index d87be0b..b608e12 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1549,4 +1549,7 @@
     <!-- Text of Negative Button in dialog -->
     <string name="no_button">No</string>
 
+    <!-- The label to display as a section header in the contact list for an SDN directory [CHAR LIMIT=40] -->
+    <string name="sdn_contacts_directory_search_label">Carrier service numbers</string>
+
 </resources>
\ No newline at end of file
diff --git a/src/com/android/contacts/sdn/SdnProvider.kt b/src/com/android/contacts/sdn/SdnProvider.kt
new file mode 100644
index 0000000..4dd3578
--- /dev/null
+++ b/src/com/android/contacts/sdn/SdnProvider.kt
@@ -0,0 +1,296 @@
+/*
+ * Copyright 2023 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.contacts.sdn
+
+import android.content.ContentProvider
+import android.content.ContentValues
+import android.content.Context.TELECOM_SERVICE
+import android.content.UriMatcher
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.net.Uri
+import android.provider.ContactsContract
+import android.provider.ContactsContract.CommonDataKinds.Phone
+import android.provider.ContactsContract.CommonDataKinds.StructuredName
+import android.provider.ContactsContract.Contacts
+import android.provider.ContactsContract.Data
+import android.provider.ContactsContract.Directory
+import android.provider.ContactsContract.RawContacts
+import android.telecom.TelecomManager
+import android.util.Log
+import com.android.contacts.R
+
+/** Provides a way to show SDN data in search suggestions and caller id lookup. */
+class SdnProvider : ContentProvider() {
+
+  private lateinit var sdnRepository: SdnRepository
+  private lateinit var uriMatcher: UriMatcher
+
+  override fun onCreate(): Boolean {
+    Log.i(TAG, "onCreate")
+    val sdnProviderAuthority = requireContext().getString(R.string.contacts_sdn_provider_authority)
+
+    uriMatcher =
+      UriMatcher(UriMatcher.NO_MATCH).apply {
+        addURI(sdnProviderAuthority, "directories", DIRECTORIES)
+        addURI(sdnProviderAuthority, "contacts/filter/*", FILTER)
+        addURI(sdnProviderAuthority, "data/phones/filter/*", FILTER)
+        addURI(sdnProviderAuthority, "contacts/lookup/*/entities", CONTACT_LOOKUP)
+        addURI(
+          sdnProviderAuthority,
+          "contacts/lookup/*/#/entities",
+          CONTACT_LOOKUP_WITH_CONTACT_ID,
+        )
+        addURI(sdnProviderAuthority, "phone_lookup/*", PHONE_LOOKUP)
+      }
+    sdnRepository = SdnRepository(requireContext())
+    return true
+  }
+
+  override fun query(
+    uri: Uri,
+    projection: Array<out String>?,
+    selection: String?,
+    selectionArgs: Array<out String>?,
+    sortOrder: String?,
+  ): Cursor? {
+    if (projection == null) return null
+
+    val match = uriMatcher.match(uri)
+
+    if (match == DIRECTORIES) {
+      return handleDirectories(projection)
+    }
+
+    if (
+      !isCallerAllowed(uri.getQueryParameter(Directory.CALLER_PACKAGE_PARAM_KEY)) ||
+      !sdnRepository.isSdnPresent()
+    ) {
+      return null
+    }
+
+    val accountName = uri.getQueryParameter(RawContacts.ACCOUNT_NAME)
+    val accountType = uri.getQueryParameter(RawContacts.ACCOUNT_TYPE)
+    if (ACCOUNT_NAME != accountName || ACCOUNT_TYPE != accountType) {
+      Log.e(TAG, "Received an invalid account")
+      return null
+    }
+
+    return when (match) {
+      FILTER -> handleFilter(projection, uri)
+      CONTACT_LOOKUP -> handleLookup(projection, uri.pathSegments[2])
+      CONTACT_LOOKUP_WITH_CONTACT_ID ->
+        handleLookup(projection, uri.pathSegments[2], uri.pathSegments[3])
+      PHONE_LOOKUP -> handlePhoneLookup(projection, uri.pathSegments[1])
+      else -> null
+    }
+  }
+
+  override fun getType(uri: Uri) = Contacts.CONTENT_ITEM_TYPE
+
+  override fun insert(uri: Uri, values: ContentValues?): Uri? {
+    throw UnsupportedOperationException("Insert is not supported.")
+  }
+
+  override fun delete(uri: Uri, selection: String?, selectionArgs: Array<out String>?): Int {
+    throw UnsupportedOperationException("Delete is not supported.")
+  }
+
+  override fun update(
+    uri: Uri,
+    values: ContentValues?,
+    selection: String?,
+    selectionArgs: Array<out String>?,
+  ): Int {
+    throw UnsupportedOperationException("Update is not supported.")
+  }
+
+  private fun handleDirectories(projection: Array<out String>): Cursor {
+    // logger.atInfo().log("Creating directory cursor")
+
+    return MatrixCursor(projection).apply {
+      addRow(
+        projection.map { column ->
+          when (column) {
+            Directory.ACCOUNT_NAME -> ACCOUNT_NAME
+            Directory.ACCOUNT_TYPE -> ACCOUNT_TYPE
+            Directory.DISPLAY_NAME -> ACCOUNT_NAME
+            Directory.TYPE_RESOURCE_ID -> R.string.sdn_contacts_directory_search_label
+            Directory.EXPORT_SUPPORT -> Directory.EXPORT_SUPPORT_NONE
+            Directory.SHORTCUT_SUPPORT -> Directory.SHORTCUT_SUPPORT_NONE
+            Directory.PHOTO_SUPPORT -> Directory.PHOTO_SUPPORT_THUMBNAIL_ONLY
+            else -> null
+          }
+        },
+      )
+    }
+  }
+
+  private fun handleFilter(projection: Array<out String>, uri: Uri): Cursor? {
+    val filter = uri.lastPathSegment ?: return null
+    val cursor = MatrixCursor(projection)
+
+    val results =
+      sdnRepository.fetchSdn().filter {
+        it.serviceName.contains(filter, ignoreCase = true) || it.serviceNumber.contains(filter)
+      }
+
+    if (results.isEmpty()) return cursor
+
+    val maxResult = getQueryLimit(uri)
+
+    results.take(maxResult).forEachIndexed { index, data ->
+      cursor.addRow(
+        projection.map { column ->
+          when (column) {
+            Contacts._ID -> index
+            Contacts.DISPLAY_NAME -> data.serviceName
+            Data.DATA1 -> data.serviceNumber
+            Contacts.LOOKUP_KEY -> data.lookupKey()
+            else -> null
+          }
+        },
+      )
+    }
+
+    return cursor
+  }
+
+  private fun handleLookup(
+    projection: Array<out String>,
+    lookupKey: String?,
+    contactIdFromUri: String? = "1",
+  ): Cursor? {
+    if (lookupKey.isNullOrEmpty()) {
+      Log.i(TAG, "handleLookup did not receive a lookup key")
+      return null
+    }
+
+    val cursor = MatrixCursor(projection)
+    val contactId =
+      try {
+        contactIdFromUri?.toLong() ?: 1L
+      } catch (_: NumberFormatException) {
+        1L
+      }
+
+    val result = sdnRepository.fetchSdn().find { it.lookupKey() == lookupKey } ?: return cursor
+
+    // Adding first row for name
+    cursor.addRow(
+      projection.map { column ->
+        when (column) {
+          Contacts.Entity.CONTACT_ID -> contactId
+          Contacts.Entity.RAW_CONTACT_ID -> contactId
+          Contacts.Entity.DATA_ID -> 1
+          Data.MIMETYPE -> StructuredName.CONTENT_ITEM_TYPE
+          StructuredName.DISPLAY_NAME -> result.serviceName
+          StructuredName.GIVEN_NAME -> result.serviceName
+          Contacts.DISPLAY_NAME -> result.serviceName
+          Contacts.DISPLAY_NAME_ALTERNATIVE -> result.serviceName
+          RawContacts.ACCOUNT_NAME -> ACCOUNT_NAME
+          RawContacts.ACCOUNT_TYPE -> ACCOUNT_TYPE
+          RawContacts.RAW_CONTACT_IS_READ_ONLY -> 1
+          Contacts.LOOKUP_KEY -> result.lookupKey()
+          else -> null
+        }
+      }
+    )
+
+    // Adding second row for number
+    cursor.addRow(
+      projection.map { column ->
+        when (column) {
+          Contacts.Entity.CONTACT_ID -> contactId
+          Contacts.Entity.RAW_CONTACT_ID -> contactId
+          Contacts.Entity.DATA_ID -> 2
+          Data.MIMETYPE -> Phone.CONTENT_ITEM_TYPE
+          Phone.NUMBER -> result.serviceNumber
+          Data.IS_PRIMARY -> 1
+          Phone.TYPE -> Phone.TYPE_MAIN
+          else -> null
+        }
+      }
+    )
+
+    return cursor
+  }
+
+  private fun handlePhoneLookup(
+    projection: Array<out String>,
+    phoneNumber: String?,
+  ): Cursor? {
+    if (phoneNumber.isNullOrEmpty()) {
+      Log.i(TAG, "handlePhoneLookup did not receive a phoneNumber")
+      return null
+    }
+
+    val cursor = MatrixCursor(projection)
+
+    val result = sdnRepository.fetchSdn().find { it.serviceNumber == phoneNumber } ?: return cursor
+
+    cursor.addRow(
+      projection.map { column ->
+        when (column) {
+          Contacts.DISPLAY_NAME -> result.serviceName
+          Phone.NUMBER -> result.serviceNumber
+          else -> null
+        }
+      },
+    )
+
+    return cursor
+  }
+
+  private fun isCallerAllowed(callingPackage: String?): Boolean {
+    if (callingPackage.isNullOrEmpty()) {
+      Log.i(TAG, "Calling package is null or empty.")
+      return false
+    }
+
+    if (callingPackage == requireContext().packageName) {
+      return true
+    }
+
+    // Check if the calling package is default dialer app or not
+    val context = context ?: return false
+    val tm = context.getSystemService(TELECOM_SERVICE) as TelecomManager
+    return tm.defaultDialerPackage == callingPackage
+  }
+
+  private fun getQueryLimit(uri: Uri): Int {
+    return try {
+      uri.getQueryParameter(ContactsContract.LIMIT_PARAM_KEY)?.toInt() ?: DEFAULT_MAX_RESULTS
+    } catch (e: NumberFormatException) {
+      DEFAULT_MAX_RESULTS
+    }
+  }
+
+  companion object {
+    private val TAG = SdnProvider::class.java.simpleName
+
+    private const val DIRECTORIES = 0
+    private const val FILTER = 1
+    private const val CONTACT_LOOKUP = 2
+    private const val CONTACT_LOOKUP_WITH_CONTACT_ID = 3
+    private const val PHONE_LOOKUP = 4
+
+    private const val ACCOUNT_NAME = "Carrier service numbers"
+    private const val ACCOUNT_TYPE = "com.android.contacts.sdn"
+
+    private const val DEFAULT_MAX_RESULTS = 20
+  }
+}
diff --git a/src/com/android/contacts/sdn/SdnRepository.kt b/src/com/android/contacts/sdn/SdnRepository.kt
new file mode 100644
index 0000000..082adeb
--- /dev/null
+++ b/src/com/android/contacts/sdn/SdnRepository.kt
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2023 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.contacts.sdn
+
+import android.Manifest.permission
+import android.annotation.SuppressLint
+import android.content.Context
+import android.content.pm.PackageManager
+import android.telephony.CarrierConfigManager
+import android.telephony.SubscriptionManager
+import android.util.Log
+import com.android.contacts.model.SimCard
+import com.android.contacts.util.PermissionsUtil
+import com.android.contacts.util.PhoneNumberHelper
+
+/** Repository to fetch Sdn data from [CarrierConfigManager]. */
+class SdnRepository constructor(private val context: Context) {
+
+  fun isSdnPresent(): Boolean {
+    if (
+      !hasTelephony() ||
+      !PermissionsUtil.hasPermission(context, permission.READ_PHONE_STATE) ||
+      !PermissionsUtil.hasPermission(context, permission.READ_PHONE_NUMBERS) ||
+      !PermissionsUtil.hasPermission(context, permission.READ_CALL_LOG)
+    ) {
+      return false
+    }
+
+    val simCardList = getSimCardInformation()
+
+    for (simCard in simCardList) {
+      if (fetchSdnFromCarrierConfig(simCard).isNotEmpty()) {
+        Log.i(TAG, "Found SDN list from CarrierConfig")
+        return true
+      }
+    }
+    return false
+  }
+
+  fun fetchSdn(): List<Sdn> {
+    val simCardList = getSimCardInformation()
+
+    return simCardList
+      .flatMap { fetchSdnFromCarrierConfig(it) }
+      .distinct()
+      .sortedBy { it.serviceName }
+  }
+
+  // Permission check isn't recognized by the linter.
+  @SuppressLint("MissingPermission")
+  fun getSimCardInformation(): List<SimCard> {
+    val subscriptionManager = context.getSystemService(SubscriptionManager::class.java)
+    return subscriptionManager.activeSubscriptionInfoList?.filterNotNull()?.mapNotNull {
+      if (it.subscriptionId == SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
+        null
+      } else {
+        SimCard.create(it)
+      }
+    }
+      ?: emptyList()
+  }
+
+  @Suppress("Deprecation", "MissingPermission")
+  private fun fetchSdnFromCarrierConfig(simCard: SimCard): List<Sdn> {
+    val carrierConfigManager = context.getSystemService(CarrierConfigManager::class.java)
+    val carrierConfig =
+      carrierConfigManager.getConfigForSubId(simCard.subscriptionId) ?: return emptyList()
+    val nameList: List<String> =
+      carrierConfig
+        .getStringArray(CarrierConfigManager.KEY_CARRIER_SERVICE_NAME_STRING_ARRAY)
+        ?.map { it?.trim() ?: "" }
+        ?: return emptyList()
+    val numberList: List<String> =
+      carrierConfig
+        .getStringArray(CarrierConfigManager.KEY_CARRIER_SERVICE_NUMBER_STRING_ARRAY)
+        ?.map { it?.trim() ?: "" }
+        ?: return emptyList()
+    if (nameList.isEmpty() || nameList.size != numberList.size) return emptyList()
+
+    val sdnList = mutableListOf<Sdn>()
+    nameList.zip(numberList).forEach { (sdnServiceName, sdnNumber) ->
+      if (sdnServiceName.isNotBlank() && PhoneNumberHelper.isDialablePhoneNumber(sdnNumber)) {
+        sdnList.add(Sdn(sdnServiceName, sdnNumber))
+      }
+    }
+    return sdnList
+  }
+
+  private fun hasTelephony(): Boolean {
+    return context.packageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY)
+  }
+
+  companion object {
+    private val TAG = SdnRepository::class.java.simpleName
+  }
+}
+
+/** Hold the Service dialing number information to be displayed in SdnActivity. */
+data class Sdn(
+  val serviceName: String,
+  val serviceNumber: String,
+) {
+
+  /** Generate lookup key that will help identify SDN when Opening QuickContact. */
+  fun lookupKey(): String {
+    return "non-sim-sdn-" + hashCode()
+  }
+}
diff --git a/src/com/android/contacts/util/PhoneNumberHelper.java b/src/com/android/contacts/util/PhoneNumberHelper.java
index eb070b2..2f1a5b0 100644
--- a/src/com/android/contacts/util/PhoneNumberHelper.java
+++ b/src/com/android/contacts/util/PhoneNumberHelper.java
@@ -16,6 +16,7 @@
 package com.android.contacts.util;
 
 import android.telephony.PhoneNumberUtils;
+import android.text.TextUtils;
 import android.util.Log;
 
 /**
@@ -95,4 +96,24 @@
         }
         return number.substring(0, delimiterIndex);
     }
+
+    /** Returns true if the given string is dialable by the user from Phone/Dialer app. */
+    public static boolean isDialablePhoneNumber(String str) {
+        if (TextUtils.isEmpty(str)) {
+            return false;
+        }
+
+        for (int i = 0, count = str.length(); i < count; i++) {
+            if (!(PhoneNumberUtils.isDialable(str.charAt(i))
+                || str.charAt(i) == ' '
+                || str.charAt(i) == '-'
+                || str.charAt(i) == '('
+                || str.charAt(i) == ')'
+                || str.charAt(i) == '.'
+                || str.charAt(i) == '/')) {
+                return false;
+            }
+        }
+        return true;
+    }
 }