diff --git a/java/com/android/dialer/dialpadview/DialpadAlphabets.java b/java/com/android/dialer/dialpadview/DialpadAlphabets.java
new file mode 100644
index 0000000..f02ca43
--- /dev/null
+++ b/java/com/android/dialer/dialpadview/DialpadAlphabets.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 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.dialer.dialpadview;
+
+import android.support.v4.util.SimpleArrayMap;
+
+/** A class containing key-letter mappings for the dialpad. */
+public class DialpadAlphabets {
+
+  // The default mapping (the Latin alphabet)
+  private static final String[] def = {
+    "+" /* 0 */,
+    "" /* 1 */,
+    "ABC" /* 2 */,
+    "DEF" /* 3 */,
+    "GHI" /* 4 */,
+    "JKL" /* 5 */,
+    "MNO" /* 6 */,
+    "PQRS" /* 7 */,
+    "TUV" /* 8 */,
+    "WXYZ" /* 9 */,
+    "" /* * */,
+    "" /* # */,
+  };
+
+  // Russian
+  private static final String[] rus = {
+    "" /* 0 */,
+    "" /* 1 */,
+    "АБВГ" /* 2 */,
+    "ДЕЖЗ" /* 3 */,
+    "ИЙКЛ" /* 4 */,
+    "МНОП" /* 5 */,
+    "РСТУ" /* 6 */,
+    "ФХЦЧ" /* 7 */,
+    "ШЩЪЫ" /* 8 */,
+    "ЬЭЮЯ" /* 9 */,
+    "" /* * */,
+    "" /* # */,
+  };
+
+  // A map in which each key is an ISO 639-2 language code and the corresponding key is an array
+  // defining key-letter mappings
+  private static final SimpleArrayMap<String, String[]> alphabets = new SimpleArrayMap<>();
+
+  static {
+    alphabets.put("rus", rus);
+  }
+
+  /**
+   * Returns the alphabet (a key-letter mapping) of the given ISO 639-2 language code or null if
+   *
+   * <ul>
+   *   <li>no alphabet for the language code is defined, or
+   *   <li>the language code is invalid.
+   * </ul>
+   */
+  public static String[] getAlphabetForLanguage(String languageCode) {
+    return alphabets.get(languageCode);
+  }
+
+  /** Returns the default key-letter mapping (the one that uses the Latin alphabet). */
+  public static String[] getDefaultAlphabet() {
+    return def;
+  }
+}
diff --git a/java/com/android/dialer/dialpadview/DialpadView.java b/java/com/android/dialer/dialpadview/DialpadView.java
index 5e79cb5..38ab383 100644
--- a/java/com/android/dialer/dialpadview/DialpadView.java
+++ b/java/com/android/dialer/dialpadview/DialpadView.java
@@ -29,6 +29,7 @@
 import android.text.TextUtils;
 import android.text.style.TtsSpan;
 import android.util.AttributeSet;
+import android.util.TypedValue;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
@@ -73,38 +74,21 @@
         R.id.pound
       };
 
-  // Resource IDs for the button-letter mapping
-  private static final int[] LETTER_MAPPING_IDS =
-      new int[] {
-        R.string.dialpad_0_letters,
-        R.string.dialpad_1_letters,
-        R.string.dialpad_2_letters,
-        R.string.dialpad_3_letters,
-        R.string.dialpad_4_letters,
-        R.string.dialpad_5_letters,
-        R.string.dialpad_6_letters,
-        R.string.dialpad_7_letters,
-        R.string.dialpad_8_letters,
-        R.string.dialpad_9_letters,
-        R.string.dialpad_star_letters,
-        R.string.dialpad_pound_letters
-      };
-
-  // Whether the device is in landscape mode
-  private final boolean mIsLandscape;
-
-  // Whether the dialpad is shown in a right-to-left locale
-  private final boolean mIsRtl;
+  private final AttributeSet mAttributeSet;
+  private final ColorStateList mRippleColor;
+  private final String[] mPrimaryLettersMapping;
+  private final String[] mSecondaryLettersMapping;
+  private final boolean mIsLandscape; // whether the device is in landscape mode
+  private final boolean mIsRtl; // whether the dialpad is shown in a right-to-left locale
+  private final int mTranslateDistance;
 
   private EditText mDigits;
   private ImageButton mDelete;
   private View mOverflowMenuButton;
-  private ColorStateList mRippleColor;
   private ViewGroup mRateContainer;
   private TextView mIldCountry;
   private TextView mIldRate;
   private boolean mCanDigitsBeEdited;
-  private int mTranslateDistance;
 
   public DialpadView(Context context) {
     this(context, null);
@@ -116,6 +100,7 @@
 
   public DialpadView(Context context, AttributeSet attrs, int defStyle) {
     super(context, attrs, defStyle);
+    mAttributeSet = attrs;
 
     TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Dialpad);
     mRippleColor = a.getColorStateList(R.styleable.Dialpad_dialpad_key_button_touch_tint);
@@ -128,6 +113,10 @@
         getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;
     mIsRtl =
         TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()) == View.LAYOUT_DIRECTION_RTL;
+
+    mPrimaryLettersMapping = DialpadAlphabets.getDefaultAlphabet();
+    mSecondaryLettersMapping =
+        DialpadAlphabets.getAlphabetForLanguage(CompatUtils.getLocale(context).getISO3Language());
   }
 
   @Override
@@ -180,7 +169,7 @@
         // The content description is used for Talkback key presses. The number is
         // separated by a "," to introduce a slight delay. Convert letters into a verbatim
         // span so that they are read as letters instead of as one word.
-        String letters = resources.getString(LETTER_MAPPING_IDS[i]);
+        String letters = mPrimaryLettersMapping[i];
         Spannable spannable =
             Spannable.Factory.getInstance().newSpannable(numberString + "," + letters);
         spannable.setSpan(
@@ -202,9 +191,31 @@
       dialpadKey.setContentDescription(numberContentDescription);
       dialpadKey.setBackground(rippleBackground);
 
-      TextView lettersView = (TextView) dialpadKey.findViewById(R.id.dialpad_key_letters);
-      if (lettersView != null) {
-        lettersView.setText(resources.getString(LETTER_MAPPING_IDS[i]));
+      TextView primaryLettersView = (TextView) dialpadKey.findViewById(R.id.dialpad_key_letters);
+      TextView secondaryLettersView =
+          (TextView) dialpadKey.findViewById(R.id.dialpad_key_secondary_letters);
+      if (primaryLettersView != null) {
+        primaryLettersView.setText(mPrimaryLettersMapping[i]);
+      }
+      if (primaryLettersView != null && secondaryLettersView != null) {
+        if (mSecondaryLettersMapping == null) {
+          secondaryLettersView.setVisibility(View.GONE);
+        } else {
+          secondaryLettersView.setVisibility(View.VISIBLE);
+          secondaryLettersView.setText(mSecondaryLettersMapping[i]);
+
+          // Adjust the font size of the letters if a secondary alphabet is available.
+          TypedArray a =
+              getContext()
+                  .getTheme()
+                  .obtainStyledAttributes(mAttributeSet, R.styleable.Dialpad, 0, 0);
+          int textSize =
+              a.getDimensionPixelSize(
+                  R.styleable.Dialpad_dialpad_key_letters_size_for_dual_alphabets, 0);
+          a.recycle();
+          primaryLettersView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
+          secondaryLettersView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
+        }
       }
     }
 
diff --git a/java/com/android/dialer/dialpadview/res/layout-land/dialpad_key.xml b/java/com/android/dialer/dialpadview/res/layout-land/dialpad_key.xml
index 769e2d8..d61c636 100644
--- a/java/com/android/dialer/dialpadview/res/layout-land/dialpad_key.xml
+++ b/java/com/android/dialer/dialpadview/res/layout-land/dialpad_key.xml
@@ -42,6 +42,10 @@
       <com.android.dialer.dialpadview.DialpadTextView
           android:id="@+id/dialpad_key_letters"
           style="@style/DialpadKeyLettersStyle"/>
+      <com.android.dialer.dialpadview.DialpadTextView
+          android:id="@+id/dialpad_key_secondary_letters"
+          style="@style/DialpadKeyLettersStyle"
+          android:layout_marginTop="2dp"/>
     </LinearLayout>
 
     <!-- A placeholder to make the width the same as other keys. -->
diff --git a/java/com/android/dialer/dialpadview/res/layout/dialpad_key.xml b/java/com/android/dialer/dialpadview/res/layout/dialpad_key.xml
index bb9ec63..01cbc92 100644
--- a/java/com/android/dialer/dialpadview/res/layout/dialpad_key.xml
+++ b/java/com/android/dialer/dialpadview/res/layout/dialpad_key.xml
@@ -34,6 +34,10 @@
       <com.android.dialer.dialpadview.DialpadTextView
           android:id="@+id/dialpad_key_letters"
           style="@style/DialpadKeyLettersStyle"/>
+      <com.android.dialer.dialpadview.DialpadTextView
+          android:id="@+id/dialpad_key_secondary_letters"
+          style="@style/DialpadKeyLettersStyle"
+          android:layout_marginTop="2dp"/>
     </LinearLayout>
   </LinearLayout>
 </com.android.dialer.dialpadview.DialpadKeyButton>
diff --git a/java/com/android/dialer/dialpadview/res/values-land/styles.xml b/java/com/android/dialer/dialpadview/res/values-land/styles.xml
index de9ef1f..abf5558 100644
--- a/java/com/android/dialer/dialpadview/res/values-land/styles.xml
+++ b/java/com/android/dialer/dialpadview/res/values-land/styles.xml
@@ -50,7 +50,7 @@
 
   <style name="DialpadKeyLettersStyle">
     <item name="android:textColor">?attr/dialpad_text_color_secondary</item>
-    <item name="android:textSize">@dimen/dialpad_key_letters_size</item>
+    <item name="android:textSize">?attr/dialpad_key_letters_size_for_single_alphabet</item>
     <item name="android:fontFamily">sans-serif-regular</item>
     <item name="android:layout_width">wrap_content</item>
     <item name="android:layout_height">wrap_content</item>
diff --git a/java/com/android/dialer/dialpadview/res/values/attrs.xml b/java/com/android/dialer/dialpadview/res/values/attrs.xml
index 9722638..61c9c20 100644
--- a/java/com/android/dialer/dialpadview/res/values/attrs.xml
+++ b/java/com/android/dialer/dialpadview/res/values/attrs.xml
@@ -23,6 +23,8 @@
     <attr format="color" name="dialpad_key_button_touch_tint"/>
     <attr format="dimension" name="dialpad_digits_adjustable_text_size"/>
     <attr format="dimension" name="dialpad_digits_adjustable_height"/>
+    <attr format="dimension" name="dialpad_key_letters_size_for_dual_alphabets"/>
+    <attr format="dimension" name="dialpad_key_letters_size_for_single_alphabet"/>
     <attr format="dimension" name="dialpad_key_numbers_size"/>
     <attr format="dimension" name="dialpad_key_number_margin_bottom"/>
   </declare-styleable>
diff --git a/java/com/android/dialer/dialpadview/res/values/dimens.xml b/java/com/android/dialer/dialpadview/res/values/dimens.xml
index 797d7e8..4b386ee 100644
--- a/java/com/android/dialer/dialpadview/res/values/dimens.xml
+++ b/java/com/android/dialer/dialpadview/res/values/dimens.xml
@@ -17,7 +17,8 @@
 <resources>
   <!-- Text dimensions for dialpad keys -->
   <dimen name="dialpad_key_numbers_default_size">36dp</dimen>
-  <dimen name="dialpad_key_letters_size">12sp</dimen>
+  <dimen name="dialpad_key_letters_default_size_for_single_alphabet">12sp</dimen>
+  <dimen name="dialpad_key_letters_default_size_for_dual_alphabets">10sp</dimen>
   <dimen name="dialpad_key_pound_size">23sp</dimen>
   <dimen name="dialpad_key_star_size">36sp</dimen>
   <dimen name="dialpad_key_height">64dp</dimen>
diff --git a/java/com/android/dialer/dialpadview/res/values/strings.xml b/java/com/android/dialer/dialpadview/res/values/strings.xml
index b3e92f1..4815416 100644
--- a/java/com/android/dialer/dialpadview/res/values/strings.xml
+++ b/java/com/android/dialer/dialpadview/res/values/strings.xml
@@ -18,19 +18,6 @@
   <string name="dialpad_star_number" translatable="false">*</string>
   <string name="dialpad_pound_number" translatable="false">#</string>
 
-  <string name="dialpad_0_letters" translatable="false">+</string>
-  <string name="dialpad_1_letters" translatable="false"></string>
-  <string name="dialpad_2_letters" translatable="false">ABC</string>
-  <string name="dialpad_3_letters" translatable="false">DEF</string>
-  <string name="dialpad_4_letters" translatable="false">GHI</string>
-  <string name="dialpad_5_letters" translatable="false">JKL</string>
-  <string name="dialpad_6_letters" translatable="false">MNO</string>
-  <string name="dialpad_7_letters" translatable="false">PQRS</string>
-  <string name="dialpad_8_letters" translatable="false">TUV</string>
-  <string name="dialpad_9_letters" translatable="false">WXYZ</string>
-  <string name="dialpad_star_letters" translatable="false"></string>
-  <string name="dialpad_pound_letters" translatable="false"></string>
-
   <!-- String describing the back button in the dialpad. -->
   <string name="description_dialpad_back">Navigate back</string>
 
diff --git a/java/com/android/dialer/dialpadview/res/values/styles.xml b/java/com/android/dialer/dialpadview/res/values/styles.xml
index 653fe48..522e92a 100644
--- a/java/com/android/dialer/dialpadview/res/values/styles.xml
+++ b/java/com/android/dialer/dialpadview/res/values/styles.xml
@@ -56,7 +56,7 @@
 
   <style name="DialpadKeyLettersStyle">
     <item name="android:textColor">?attr/dialpad_text_color_secondary</item>
-    <item name="android:textSize">@dimen/dialpad_key_letters_size</item>
+    <item name="android:textSize">?attr/dialpad_key_letters_size_for_single_alphabet</item>
     <item name="android:fontFamily">sans-serif-regular</item>
     <item name="android:layout_width">wrap_content</item>
     <item name="android:layout_height">wrap_content</item>
@@ -85,8 +85,15 @@
   <style name="Dialpad">
     <item name="dialpad_digits_adjustable_height">@dimen/dialpad_digits_height</item>
     <item name="dialpad_digits_adjustable_text_size">@dimen/dialpad_digits_text_size</item>
+    <item name="dialpad_key_letters_size_for_dual_alphabets">
+      @dimen/dialpad_key_letters_default_size_for_dual_alphabets
+    </item>
+    <item name="dialpad_key_letters_size_for_single_alphabet">
+      @dimen/dialpad_key_letters_default_size_for_single_alphabet
+    </item>
     <item name="dialpad_key_numbers_size">@dimen/dialpad_key_numbers_default_size</item>
-    <item name="dialpad_key_number_margin_bottom">@dimen/dialpad_key_number_default_margin_bottom
+    <item name="dialpad_key_number_margin_bottom">
+      @dimen/dialpad_key_number_default_margin_bottom
     </item>
     <item name="dialpad_end_key_spacing">@dimen/dialpad_bottom_space_height</item>
     <item name="dialpad_elevation">0dp</item>
diff --git a/java/com/android/incallui/res/values-sw360dp/dimens.xml b/java/com/android/incallui/res/values-sw360dp/dimens.xml
index bb74a02..80b74e5 100644
--- a/java/com/android/incallui/res/values-sw360dp/dimens.xml
+++ b/java/com/android/incallui/res/values-sw360dp/dimens.xml
@@ -23,6 +23,10 @@
   </dimen>
   <dimen name="incall_dialpad_digits_adjustable_text_size">@dimen/dialpad_digits_text_size</dimen>
   <dimen name="incall_dialpad_digits_adjustable_height">@dimen/dialpad_digits_height</dimen>
+  <dimen name="incall_dialpad_key_letters_size_for_dual_alphabets">9sp</dimen>
+  <dimen name="incall_dialpad_key_letters_size_for_single_alphabet">
+    @dimen/dialpad_key_letters_default_size_for_single_alphabet
+  </dimen>
   <dimen name="incall_dialpad_key_numbers_size">@dimen/dialpad_key_numbers_default_size</dimen>
 
 </resources>
diff --git a/java/com/android/incallui/res/values/dimens.xml b/java/com/android/incallui/res/values/dimens.xml
index 6e37229..5688169 100644
--- a/java/com/android/incallui/res/values/dimens.xml
+++ b/java/com/android/incallui/res/values/dimens.xml
@@ -22,6 +22,10 @@
   <dimen name="incall_dialpad_key_number_margin_bottom">1dp</dimen>
   <dimen name="incall_dialpad_digits_adjustable_text_size">20sp</dimen>
   <dimen name="incall_dialpad_digits_adjustable_height">50dp</dimen>
+  <dimen name="incall_dialpad_key_letters_size_for_dual_alphabets">9sp</dimen>
+  <dimen name="incall_dialpad_key_letters_size_for_single_alphabet">
+    @dimen/dialpad_key_letters_default_size_for_single_alphabet
+  </dimen>
   <dimen name="incall_dialpad_key_numbers_size">36dp</dimen>
 
   <!-- Dimension used to possibly down-scale high-res photo into what is suitable
diff --git a/java/com/android/incallui/res/values/styles.xml b/java/com/android/incallui/res/values/styles.xml
index 6a26e9c..cfa4dd6 100644
--- a/java/com/android/incallui/res/values/styles.xml
+++ b/java/com/android/incallui/res/values/styles.xml
@@ -52,6 +52,12 @@
     <item name="dialpad_digits_adjustable_height">
       @dimen/incall_dialpad_digits_adjustable_height
     </item>
+    <item name="dialpad_key_letters_size_for_dual_alphabets">
+      @dimen/incall_dialpad_key_letters_size_for_dual_alphabets
+    </item>
+    <item name="dialpad_key_letters_size_for_single_alphabet">
+      @dimen/incall_dialpad_key_letters_size_for_single_alphabet
+    </item>
     <item name="dialpad_key_numbers_size">
       @dimen/incall_dialpad_key_numbers_size
     </item>