diff --git a/java/com/android/dialer/app/calllog/ClearCallLogDialog.java b/java/com/android/dialer/app/calllog/ClearCallLogDialog.java
index b16eb1b..197d2da 100644
--- a/java/com/android/dialer/app/calllog/ClearCallLogDialog.java
+++ b/java/com/android/dialer/app/calllog/ClearCallLogDialog.java
@@ -129,7 +129,7 @@
     if (EnrichedCallComponent.get(activity).getEnrichedCallManager().hasStoredData()) {
       Snackbar.make(
               activity.findViewById(R.id.calllog_frame),
-              getString(R.string.multiple_ec_data_deleted),
+              activity.getString(R.string.multiple_ec_data_deleted),
               5_000)
           .show();
     }
diff --git a/java/com/android/dialer/assisteddialing/ConcreteCreator.java b/java/com/android/dialer/assisteddialing/ConcreteCreator.java
index 49d3b1f..a8a9d2a 100644
--- a/java/com/android/dialer/assisteddialing/ConcreteCreator.java
+++ b/java/com/android/dialer/assisteddialing/ConcreteCreator.java
@@ -23,6 +23,7 @@
 import android.support.annotation.NonNull;
 import android.telephony.TelephonyManager;
 import com.android.dialer.common.LogUtil;
+import com.android.dialer.configprovider.ConfigProvider;
 import com.android.dialer.configprovider.ConfigProviderBindings;
 
 /**
@@ -50,6 +51,8 @@
   public static AssistedDialingMediator createNewAssistedDialingMediator(
       @NonNull TelephonyManager telephonyManager, @NonNull Context context) {
 
+    ConfigProvider configProvider = ConfigProviderBindings.get(context);
+
     if (telephonyManager == null) {
       LogUtil.i(
           "ConcreteCreator.createNewAssistedDialingMediator", "provided TelephonyManager was null");
@@ -61,11 +64,13 @@
     }
 
     if ((Build.VERSION.SDK_INT < BUILD_CODE_FLOOR || Build.VERSION.SDK_INT > BUILD_CODE_CEILING)
-        || !ConfigProviderBindings.get(context).getBoolean("assisted_dialing_enabled", false)) {
+        || !configProvider.getBoolean("assisted_dialing_enabled", false)) {
       return new AssistedDialingMediatorStub();
     }
 
-    Constraints constraints = new Constraints(context);
+    Constraints constraints =
+        new Constraints(
+            context, configProvider.getString("assisted_dialing_csv_country_codes", ""));
     return new AssistedDialingMediatorImpl(
         new LocationDetector(telephonyManager), new NumberTransformer(constraints));
   }
diff --git a/java/com/android/dialer/assisteddialing/Constraints.java b/java/com/android/dialer/assisteddialing/Constraints.java
index 023be1c..c4b5278 100644
--- a/java/com/android/dialer/assisteddialing/Constraints.java
+++ b/java/com/android/dialer/assisteddialing/Constraints.java
@@ -20,6 +20,7 @@
 import android.content.Context;
 import android.os.Build.VERSION_CODES;
 import android.support.annotation.NonNull;
+import android.support.annotation.VisibleForTesting;
 import android.telephony.PhoneNumberUtils;
 import android.text.TextUtils;
 import android.util.ArraySet;
@@ -28,10 +29,13 @@
 import com.google.i18n.phonenumbers.PhoneNumberUtil;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber.CountryCodeSource;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 import java.util.Locale;
 import java.util.Optional;
 import java.util.Set;
+import java.util.StringTokenizer;
 import java.util.stream.Collectors;
 
 /** Ensures that a number is eligible for Assisted Dialing */
@@ -41,34 +45,85 @@
   private final PhoneNumberUtil phoneNumberUtil = PhoneNumberUtil.getInstance();
   private final Context context;
 
+  // TODO(erfanian): Ensure the below standard is consistent between libphonenumber and the
+  // platform.
+  // ISO 3166-1 alpha-2 Country Codes that are eligible for assisted dialing.
+  private static final List<String> DEFAULT_COUNTRY_CODES =
+      Arrays.asList(
+          "CA" /* Canada */,
+          "GB" /* United Kingdom */,
+          "JP" /* Japan */,
+          "MX" /* Mexico */,
+          "US" /* United States */);
+
+  @VisibleForTesting final Set<String> supportedCountryCodes;
+
   /**
    * Create a new instance of Constraints.
    *
    * @param context The context used to determine whether or not a number is an emergency number.
+   * @param configProviderCountryCodes A csv of supported country codes, e.g. "US,CA"
    */
-  public Constraints(@NonNull Context context) {
+  public Constraints(@NonNull Context context, @NonNull String configProviderCountryCodes) {
     if (context == null) {
       throw new NullPointerException("Provided context cannot be null");
     }
     this.context = context;
+
+    if (configProviderCountryCodes == null) {
+      throw new NullPointerException("Provided configProviderCountryCodes cannot be null");
+    }
+
+    // We allow dynamic country support only in Dialer; this should be removed in the framework
+    // implementation.
+    // TODO(erfanian): Remove in the framework implementation, or add a service to provide these
+    // values to the framework.
+    supportedCountryCodes =
+        parseConfigProviderCountryCodes(configProviderCountryCodes)
+            .stream()
+            .map(v -> v.toUpperCase(Locale.US))
+            .collect(Collectors.toCollection(ArraySet::new));
+    LogUtil.i("Constraints.Constraints", "Using country codes: " + supportedCountryCodes);
   }
 
-  // TODO(erfanian): Ensure the below standard is consistent between libphonenumber and the
-  // platform.
-  // ISO 3166-1 alpha-2 Country Codes that are eligible for assisted dialing.
-  private final String[] supportedCountryCodeValues =
-      new String[] {
-        "CA" /* Canada */,
-        "GB" /* United Kingdom */,
-        "JP" /* Japan */,
-        "MX" /* Mexico */,
-        "US" /* United States */,
-      };
+  private List<String> parseConfigProviderCountryCodes(String configProviderCountryCodes) {
+    if (TextUtils.isEmpty(configProviderCountryCodes)) {
+      LogUtil.i(
+          "Constraints.parseConfigProviderCountryCodes",
+          "configProviderCountryCodes was empty, returning default");
+      return DEFAULT_COUNTRY_CODES;
+    }
 
-  private final Set<String> supportedCountryCodes =
-      Arrays.stream(supportedCountryCodeValues)
-          .map(v -> v.toUpperCase(Locale.US))
-          .collect(Collectors.toCollection(ArraySet::new));
+    StringTokenizer tokenizer = new StringTokenizer(configProviderCountryCodes, ",");
+
+    if (tokenizer.countTokens() < 1) {
+      LogUtil.i(
+          "Constraints.parseConfigProviderCountryCodes", "insufficient provided country codes");
+      return DEFAULT_COUNTRY_CODES;
+    }
+
+    List<String> parsedCountryCodes = new ArrayList<>();
+    while (tokenizer.hasMoreTokens()) {
+      String foundLocale = tokenizer.nextToken();
+      if (foundLocale == null) {
+        LogUtil.i(
+            "Constraints.parseConfigProviderCountryCodes",
+            "Unexpected empty value, returning default.");
+        return DEFAULT_COUNTRY_CODES;
+      }
+
+      if (foundLocale.length() != 2) {
+        LogUtil.i(
+            "Constraints.parseConfigProviderCountryCodes",
+            "Unexpected locale %s, returning default",
+            foundLocale);
+        return DEFAULT_COUNTRY_CODES;
+      }
+
+      parsedCountryCodes.add(foundLocale);
+    }
+    return parsedCountryCodes;
+  }
 
   /**
    * Determines whether or not we think Assisted Dialing is possible given the provided parameters.