diff --git a/java/com/android/dialer/assisteddialing/AssistedDialingMediator.java b/java/com/android/dialer/assisteddialing/AssistedDialingMediator.java
index 756fd61..6715e2b 100644
--- a/java/com/android/dialer/assisteddialing/AssistedDialingMediator.java
+++ b/java/com/android/dialer/assisteddialing/AssistedDialingMediator.java
@@ -16,8 +16,6 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
-import android.os.Build.VERSION_CODES;
 import android.support.annotation.NonNull;
 import java.util.Optional;
 
@@ -25,14 +23,10 @@
 public interface AssistedDialingMediator {
 
   /** Returns {@code true} if the current client platform supports Assisted Dialing. */
-  public boolean isPlatformEligible();
+  boolean isPlatformEligible();
 
   /** Returns the country code in which the library thinks the user typically resides. */
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
-  public Optional<String> userHomeCountryCode();
+  Optional<String> userHomeCountryCode();
 
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
-  public Optional<TransformationInfo> attemptAssistedDial(@NonNull String numberToTransform);
+  Optional<TransformationInfo> attemptAssistedDial(@NonNull String numberToTransform);
 }
diff --git a/java/com/android/dialer/assisteddialing/AssistedDialingMediatorImpl.java b/java/com/android/dialer/assisteddialing/AssistedDialingMediatorImpl.java
index 7214437..7fdb8da 100644
--- a/java/com/android/dialer/assisteddialing/AssistedDialingMediatorImpl.java
+++ b/java/com/android/dialer/assisteddialing/AssistedDialingMediatorImpl.java
@@ -16,10 +16,7 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
-import android.os.Build.VERSION_CODES;
 import android.support.annotation.NonNull;
-import android.support.annotation.RequiresApi;
 import com.android.dialer.common.LogUtil;
 import java.util.Optional;
 
@@ -30,7 +27,6 @@
  * call is eligible for assisted dialing, and performing the transformation of numbers eligible for
  * assisted dialing.
  */
-@RequiresApi(VERSION_CODES.N)
 final class AssistedDialingMediatorImpl implements AssistedDialingMediator {
 
   private final LocationDetector locationDetector;
@@ -58,8 +54,6 @@
 
   /** Returns the country code in which the library thinks the user typically resides. */
   @Override
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
   public Optional<String> userHomeCountryCode() {
     return locationDetector.getUpperCaseUserHomeCountry();
   }
@@ -69,8 +63,6 @@
    * transformed number should be capable of dialing out of the User's current country and
    * successfully connecting with a contact in the User's home country.
    */
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
   @Override
   public Optional<TransformationInfo> attemptAssistedDial(@NonNull String numberToTransform) {
     Optional<String> userHomeCountryCode = locationDetector.getUpperCaseUserHomeCountry();
diff --git a/java/com/android/dialer/assisteddialing/AssistedDialingMediatorStub.java b/java/com/android/dialer/assisteddialing/AssistedDialingMediatorStub.java
index 9a40e05..cb3ca79 100644
--- a/java/com/android/dialer/assisteddialing/AssistedDialingMediatorStub.java
+++ b/java/com/android/dialer/assisteddialing/AssistedDialingMediatorStub.java
@@ -16,8 +16,6 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
-import android.os.Build.VERSION_CODES;
 import android.support.annotation.NonNull;
 import java.util.Optional;
 
@@ -26,16 +24,12 @@
 
   /** Always returns an empty Optional. */
   @Override
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
   public Optional<TransformationInfo> attemptAssistedDial(@NonNull String numberToTransform) {
     return Optional.empty();
   }
 
   /** Always returns an empty Optional. */
   @Override
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
   public Optional<String> userHomeCountryCode() {
     return Optional.empty();
   }
diff --git a/java/com/android/dialer/assisteddialing/ConcreteCreator.java b/java/com/android/dialer/assisteddialing/ConcreteCreator.java
index 0507743..ab8ea70 100644
--- a/java/com/android/dialer/assisteddialing/ConcreteCreator.java
+++ b/java/com/android/dialer/assisteddialing/ConcreteCreator.java
@@ -16,13 +16,11 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
 import android.content.Context;
 import android.os.Build;
 import android.os.Build.VERSION_CODES;
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
-import android.support.annotation.VisibleForTesting;
 import android.support.v4.os.UserManagerCompat;
 import android.telephony.TelephonyManager;
 import com.android.dialer.common.LogUtil;
@@ -36,13 +34,10 @@
  * <p>This helps keep the dependencies required by AssistedDialingMediator for assisted dialing
  * explicit.
  */
-@TargetApi(VERSION_CODES.N)
 public final class ConcreteCreator {
 
-  // Floor set at N due to use of Optional.
-  @VisibleForTesting public static final int BUILD_CODE_FLOOR = Build.VERSION_CODES.N;
   // Ceiling set at P because this feature will ship as part of the framework in Q.
-  @VisibleForTesting public static final int BUILD_CODE_CEILING = 28;
+  public static final int BUILD_CODE_CEILING = VERSION_CODES.P;
 
   /**
    * Creates a new AssistedDialingMediator
@@ -105,8 +100,7 @@
       throw new NullPointerException("Provided configProvider was null");
     }
 
-    return (Build.VERSION.SDK_INT >= BUILD_CODE_FLOOR
-            && Build.VERSION.SDK_INT <= BUILD_CODE_CEILING)
+    return Build.VERSION.SDK_INT <= BUILD_CODE_CEILING
         && configProvider.getBoolean("assisted_dialing_enabled", false);
   }
 
diff --git a/java/com/android/dialer/assisteddialing/Constraints.java b/java/com/android/dialer/assisteddialing/Constraints.java
index cae3734..41a3e92 100644
--- a/java/com/android/dialer/assisteddialing/Constraints.java
+++ b/java/com/android/dialer/assisteddialing/Constraints.java
@@ -16,9 +16,7 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
 import android.content.Context;
-import android.os.Build.VERSION_CODES;
 import android.support.annotation.NonNull;
 import android.telephony.PhoneNumberUtils;
 import android.text.TextUtils;
@@ -35,8 +33,6 @@
 import java.util.Optional;
 
 /** Ensures that a number is eligible for Assisted Dialing */
-@TargetApi(VERSION_CODES.N)
-@SuppressWarnings("AndroidApiChecker") // Use of optional
 final class Constraints {
   private final PhoneNumberUtil phoneNumberUtil;
   private final Context context;
@@ -46,7 +42,7 @@
    * 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"
+   * @param countryCodeProvider A csv of supported country codes, e.g. "US,CA"
    */
   public Constraints(@NonNull Context context, @NonNull CountryCodeProvider countryCodeProvider) {
     if (context == null) {
@@ -73,7 +69,7 @@
    * @return A boolean indicating whether or not the provided values are eligible for assisted
    *     dialing.
    */
-  public boolean meetsPreconditions(
+  boolean meetsPreconditions(
       @NonNull String numberToCheck,
       @NonNull String userHomeCountryCode,
       @NonNull String userRoamingCountryCode) {
diff --git a/java/com/android/dialer/assisteddialing/CountryCodeProvider.java b/java/com/android/dialer/assisteddialing/CountryCodeProvider.java
index 118696e..04b2291 100644
--- a/java/com/android/dialer/assisteddialing/CountryCodeProvider.java
+++ b/java/com/android/dialer/assisteddialing/CountryCodeProvider.java
@@ -16,8 +16,6 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
-import android.os.Build.VERSION_CODES;
 import android.support.annotation.VisibleForTesting;
 import android.text.TextUtils;
 import android.util.ArraySet;
@@ -32,8 +30,6 @@
 import java.util.stream.Collectors;
 
 /** A class to provide the appropriate country codes related to assisted dialing. */
-@TargetApi(VERSION_CODES.N)
-@SuppressWarnings("AndroidApiChecker") // Java 8 APIs
 public final class CountryCodeProvider {
 
   // TODO(erfanian): Ensure the below standard is consistent between libphonenumber and the
diff --git a/java/com/android/dialer/assisteddialing/LocationDetector.java b/java/com/android/dialer/assisteddialing/LocationDetector.java
index 8e7535c..9fa9441 100644
--- a/java/com/android/dialer/assisteddialing/LocationDetector.java
+++ b/java/com/android/dialer/assisteddialing/LocationDetector.java
@@ -16,8 +16,6 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
-import android.os.Build.VERSION_CODES;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.telephony.TelephonyManager;
@@ -36,7 +34,7 @@
   private final TelephonyManager telephonyManager;
   private final String userProvidedHomeCountry;
 
-  public LocationDetector(
+  LocationDetector(
       @NonNull TelephonyManager telephonyManager, @Nullable String userProvidedHomeCountry) {
     if (telephonyManager == null) {
       throw new NullPointerException("Provided TelephonyManager was null");
@@ -53,9 +51,7 @@
    * Returns what we believe to be the User's home country. This should resolve to
    * PROPERTY_ICC_OPERATOR_ISO_COUNTRY
    */
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
-  public Optional<String> getUpperCaseUserHomeCountry() {
+  Optional<String> getUpperCaseUserHomeCountry() {
 
     if (!TextUtils.isEmpty(userProvidedHomeCountry)) {
       LogUtil.i(
@@ -73,9 +69,7 @@
   }
 
   /** Returns what we believe to be the User's current (roaming) country */
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
-  public Optional<String> getUpperCaseUserRoamingCountry() {
+  Optional<String> getUpperCaseUserRoamingCountry() {
     // TODO Increase coverage of location resolution??
     String networkCountryIso = telephonyManager.getNetworkCountryIso();
     if (networkCountryIso != null) {
diff --git a/java/com/android/dialer/assisteddialing/NumberTransformer.java b/java/com/android/dialer/assisteddialing/NumberTransformer.java
index 8bbad32..eabf856 100644
--- a/java/com/android/dialer/assisteddialing/NumberTransformer.java
+++ b/java/com/android/dialer/assisteddialing/NumberTransformer.java
@@ -16,9 +16,6 @@
 
 package com.android.dialer.assisteddialing;
 
-import android.annotation.TargetApi;
-import android.os.Build.VERSION_CODES;
-import android.support.annotation.NonNull;
 import android.text.TextUtils;
 import com.android.dialer.common.LogUtil;
 import com.android.dialer.strictmode.StrictModeUtils;
@@ -33,21 +30,9 @@
   private final PhoneNumberUtil phoneNumberUtil;
   private final Constraints constraints;
 
-  public NumberTransformer(Constraints constraints) {
+  NumberTransformer(Constraints constraints) {
     this.constraints = constraints;
-    this.phoneNumberUtil = StrictModeUtils.bypass(() -> PhoneNumberUtil.getInstance());
-  }
-
-  /**
-   * Returns a boolean for callers to quickly determine whether or not the AssistedDialingMediator
-   * thinks an attempt at assisted dialing is likely to succeed.
-   */
-  public boolean canDoAssistedDialingTransformation(
-      @NonNull String numberToCheck,
-      @NonNull String userHomeCountryCode,
-      @NonNull String userRoamingCountryCode) {
-    return constraints.meetsPreconditions(
-        numberToCheck, userHomeCountryCode, userRoamingCountryCode);
+    this.phoneNumberUtil = StrictModeUtils.bypass(PhoneNumberUtil::getInstance);
   }
 
   /**
@@ -57,9 +42,7 @@
    * transformation fails, we return an empty optional. The operation can be considered a success
    * when the Optional we return has a value set.
    */
-  @SuppressWarnings("AndroidApiChecker") // Use of optional
-  @TargetApi(VERSION_CODES.N)
-  public Optional<TransformationInfo> doAssistedDialingTransformation(
+  Optional<TransformationInfo> doAssistedDialingTransformation(
       String numbertoTransform, String userHomeCountryCode, String userRoamingCountryCode) {
 
     if (!constraints.meetsPreconditions(
diff --git a/java/com/android/dialer/assisteddialing/ui/AssistedDialingSettingFragment.java b/java/com/android/dialer/assisteddialing/ui/AssistedDialingSettingFragment.java
index 965a169..2da2528 100644
--- a/java/com/android/dialer/assisteddialing/ui/AssistedDialingSettingFragment.java
+++ b/java/com/android/dialer/assisteddialing/ui/AssistedDialingSettingFragment.java
@@ -15,10 +15,8 @@
  */
 package com.android.dialer.assisteddialing.ui;
 
-import android.annotation.TargetApi;
 import android.icu.util.ULocale;
 import android.icu.util.ULocale.Builder;
-import android.os.Build.VERSION_CODES;
 import android.os.Bundle;
 import android.preference.ListPreference;
 import android.preference.Preference;
@@ -38,8 +36,6 @@
 import java.util.Optional;
 
 /** The setting for Assisted Dialing */
-@TargetApi(VERSION_CODES.N)
-@SuppressWarnings("AndroidApiChecker") // Java 8 APIs
 public class AssistedDialingSettingFragment extends PreferenceFragment {
 
   private CountryCodeProvider countryCodeProvider;