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diff --git a/java/com/android/dialer/compat/telephony/TelephonyManagerCompat.java b/java/com/android/dialer/compat/telephony/TelephonyManagerCompat.java
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+/*
+ * Copyright (C) 2015 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.compat.telephony;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Build.VERSION;
+import android.os.Build.VERSION_CODES;
+import android.support.annotation.Nullable;
+import android.support.v4.os.BuildCompat;
+import android.telecom.PhoneAccountHandle;
+import android.telephony.TelephonyManager;
+import com.android.dialer.common.Assert;
+import com.android.dialer.common.LogUtil;
+import com.android.dialer.telecom.TelecomUtil;
+import java.lang.reflect.InvocationTargetException;
+
+public class TelephonyManagerCompat {
+
+  // TODO(maxwelb): Use public API for these constants when available
+  public static final String EVENT_HANDOVER_VIDEO_FROM_WIFI_TO_LTE =
+      "android.telephony.event.EVENT_HANDOVER_VIDEO_FROM_WIFI_TO_LTE";
+  public static final String EVENT_HANDOVER_TO_WIFI_FAILED =
+      "android.telephony.event.EVENT_HANDOVER_TO_WIFI_FAILED";
+  public static final String EVENT_CALL_REMOTELY_HELD = "android.telecom.event.CALL_REMOTELY_HELD";
+  public static final String EVENT_CALL_REMOTELY_UNHELD =
+      "android.telecom.event.CALL_REMOTELY_UNHELD";
+  public static final String EVENT_MERGE_START = "android.telecom.event.MERGE_START";
+  public static final String EVENT_MERGE_COMPLETE = "android.telecom.event.MERGE_COMPLETE";
+
+  public static final String EVENT_NOTIFY_INTERNATIONAL_CALL_ON_WFC =
+      "android.telephony.event.EVENT_NOTIFY_INTERNATIONAL_CALL_ON_WFC";
+
+  public static final String TELEPHONY_MANAGER_CLASS = "android.telephony.TelephonyManager";
+
+  private static final String SECRET_CODE_ACTION = "android.provider.Telephony.SECRET_CODE";
+
+  // TODO(erfanian): b/63995261 Replace with the platform/telecom constant when available.
+  /**
+   * Indicates that the call being placed originated from a known contact.
+   *
+   * <p>This signals to the telephony platform that an outgoing call qualifies for assisted dialing.
+   */
+  public static final String ALLOW_ASSISTED_DIAL = "android.telecom.extra.ALLOW_ASSISTED_DIAL";
+
+  // TODO(erfanian): b/63995261 Replace with the platform/telecom constant when available.
+  /**
+   * Indicates that an outgoing call has undergone assisted dialing.
+   *
+   * <p>Unlike {@link ALLOW_ASSISTED_DIAL}, the presence of this key further indicates that a call
+   * has undergone Assisted Dialing -- not just that it qualified for Assisted Dialing.
+   */
+  public static final String IS_ASSISTED_DIALED = "android.telecom.extra.IS_ASSISTED_DIALED";
+
+  /**
+   * Returns the number of phones available. Returns 1 for Single standby mode (Single SIM
+   * functionality) Returns 2 for Dual standby mode.(Dual SIM functionality)
+   *
+   * <p>Returns 1 if the method or telephonyManager is not available.
+   *
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   */
+  public static int getPhoneCount(@Nullable TelephonyManager telephonyManager) {
+    if (telephonyManager == null) {
+      return 1;
+    }
+    return telephonyManager.getPhoneCount();
+  }
+
+  /**
+   * Whether the phone supports TTY mode.
+   *
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   * @return {@code true} if the device supports TTY mode, and {@code false} otherwise.
+   */
+  public static boolean isTtyModeSupported(@Nullable TelephonyManager telephonyManager) {
+    return telephonyManager != null && telephonyManager.isTtyModeSupported();
+  }
+
+  /**
+   * Whether the phone supports hearing aid compatibility.
+   *
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   * @return {@code true} if the device supports hearing aid compatibility, and {@code false}
+   *     otherwise.
+   */
+  public static boolean isHearingAidCompatibilitySupported(
+      @Nullable TelephonyManager telephonyManager) {
+    return telephonyManager != null && telephonyManager.isHearingAidCompatibilitySupported();
+  }
+
+  /**
+   * Returns the URI for the per-account voicemail ringtone set in Phone settings.
+   *
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   * @param accountHandle The handle for the {@link android.telecom.PhoneAccount} for which to
+   *     retrieve the voicemail ringtone.
+   * @return The URI for the ringtone to play when receiving a voicemail from a specific
+   *     PhoneAccount.
+   */
+  @Nullable
+  public static Uri getVoicemailRingtoneUri(
+      TelephonyManager telephonyManager, PhoneAccountHandle accountHandle) {
+    if (VERSION.SDK_INT < VERSION_CODES.N) {
+      return null;
+    }
+    return telephonyManager.getVoicemailRingtoneUri(accountHandle);
+  }
+
+  /**
+   * Returns whether vibration is set for voicemail notification in Phone settings.
+   *
+   * @param telephonyManager The telephony manager instance to use for method calls.
+   * @param accountHandle The handle for the {@link android.telecom.PhoneAccount} for which to
+   *     retrieve the voicemail vibration setting.
+   * @return {@code true} if the vibration is set for this PhoneAccount, {@code false} otherwise.
+   */
+  public static boolean isVoicemailVibrationEnabled(
+      TelephonyManager telephonyManager, PhoneAccountHandle accountHandle) {
+    return VERSION.SDK_INT < VERSION_CODES.N
+        || telephonyManager.isVoicemailVibrationEnabled(accountHandle);
+  }
+
+  /**
+   * This method uses a new system API to enable or disable visual voicemail. TODO(twyen): restrict
+   * to N MR1, not needed in future SDK.
+   */
+  public static void setVisualVoicemailEnabled(
+      TelephonyManager telephonyManager, PhoneAccountHandle handle, boolean enabled) {
+    if (VERSION.SDK_INT < VERSION_CODES.N_MR1) {
+      Assert.fail("setVisualVoicemailEnabled called on pre-NMR1");
+    }
+    try {
+      TelephonyManager.class
+          .getMethod("setVisualVoicemailEnabled", PhoneAccountHandle.class, boolean.class)
+          .invoke(telephonyManager, handle, enabled);
+    } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+      LogUtil.e("TelephonyManagerCompat.setVisualVoicemailEnabled", "failed", e);
+    }
+  }
+
+  /**
+   * This method uses a new system API to check if visual voicemail is enabled TODO(twyen): restrict
+   * to N MR1, not needed in future SDK.
+   */
+  public static boolean isVisualVoicemailEnabled(
+      TelephonyManager telephonyManager, PhoneAccountHandle handle) {
+    if (VERSION.SDK_INT < VERSION_CODES.N_MR1) {
+      Assert.fail("isVisualVoicemailEnabled called on pre-NMR1");
+    }
+    try {
+      return (boolean)
+          TelephonyManager.class
+              .getMethod("isVisualVoicemailEnabled", PhoneAccountHandle.class)
+              .invoke(telephonyManager, handle);
+    } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+      LogUtil.e("TelephonyManagerCompat.setVisualVoicemailEnabled", "failed", e);
+    }
+    return false;
+  }
+
+  /**
+   * Handles secret codes to launch arbitrary activities.
+   *
+   * @param context the context to use
+   * @param secretCode the secret code without the "*#*#" prefix and "#*#*" suffix
+   */
+  public static void handleSecretCode(Context context, String secretCode) {
+    // Must use system service on O+ to avoid using broadcasts, which are not allowed on O+.
+    if (BuildCompat.isAtLeastO()) {
+      if (!TelecomUtil.isDefaultDialer(context)) {
+        LogUtil.e(
+            "TelephonyManagerCompat.handleSecretCode",
+            "not default dialer, cannot send special code");
+        return;
+      }
+      context.getSystemService(TelephonyManager.class).sendDialerSpecialCode(secretCode);
+    } else {
+      // System service call is not supported pre-O, so must use a broadcast for N-.
+      Intent intent =
+          new Intent(SECRET_CODE_ACTION, Uri.parse("android_secret_code://" + secretCode));
+      context.sendBroadcast(intent);
+    }
+  }
+}