diff --git a/java/com/android/dialer/assisteddialing/ConcreteCreator.java b/java/com/android/dialer/assisteddialing/ConcreteCreator.java
index 2561e28..dfd28a6 100644
--- a/java/com/android/dialer/assisteddialing/ConcreteCreator.java
+++ b/java/com/android/dialer/assisteddialing/ConcreteCreator.java
@@ -23,7 +23,6 @@
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
 import android.support.annotation.VisibleForTesting;
-import android.support.v4.os.BuildCompat;
 import android.support.v4.os.UserManagerCompat;
 import android.telephony.TelephonyManager;
 import com.android.dialer.common.LogUtil;
@@ -42,8 +41,8 @@
 
   // Floor set at N due to use of Optional.
   @VisibleForTesting public static final int BUILD_CODE_FLOOR = Build.VERSION_CODES.N;
-  // Ceiling set at O_MR1 because this feature will ship as part of the framework in P.
-  @VisibleForTesting public static final int BUILD_CODE_CEILING = Build.VERSION_CODES.O_MR1;
+  // 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;
 
   /**
    * Creates a new AssistedDialingMediator
@@ -107,8 +106,7 @@
     }
 
     return (Build.VERSION.SDK_INT >= BUILD_CODE_FLOOR
-            && Build.VERSION.SDK_INT <= BUILD_CODE_CEILING
-            && !BuildCompat.isAtLeastP())
+            && Build.VERSION.SDK_INT <= BUILD_CODE_CEILING)
         && configProvider.getBoolean("assisted_dialing_enabled", false);
   }
 
diff --git a/java/com/android/dialer/calldetails/CallDetailsActivity.java b/java/com/android/dialer/calldetails/CallDetailsActivity.java
index 26b38ed..ec124df 100644
--- a/java/com/android/dialer/calldetails/CallDetailsActivity.java
+++ b/java/com/android/dialer/calldetails/CallDetailsActivity.java
@@ -32,7 +32,6 @@
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.annotation.RequiresPermission;
-import android.support.v4.os.BuildCompat;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
@@ -52,7 +51,6 @@
 import com.android.dialer.common.concurrent.DialerExecutor.SuccessListener;
 import com.android.dialer.common.concurrent.DialerExecutor.Worker;
 import com.android.dialer.common.concurrent.DialerExecutorComponent;
-import com.android.dialer.compat.telephony.TelephonyManagerCompat;
 import com.android.dialer.constants.ActivityRequestCodes;
 import com.android.dialer.dialercontact.DialerContact;
 import com.android.dialer.duo.Duo;
@@ -409,14 +407,8 @@
 
     @Override
     public void openAssistedDialingSettings(View unused) {
-      if (BuildCompat.isAtLeastP()) {
-        Intent callSettingsIntent =
-            new Intent(TelephonyManagerCompat.ACTION_SHOW_ASSISTED_DIALING_SETTINGS);
-        getActivity().startActivity(callSettingsIntent);
-      } else {
         Intent intent = new Intent(getActivity(), AssistedDialingSettingActivity.class);
         getActivity().startActivity(intent);
-      }
     }
 
     @Override
diff --git a/java/com/android/dialer/compat/telephony/TelephonyManagerCompat.java b/java/com/android/dialer/compat/telephony/TelephonyManagerCompat.java
index 669cba7..236f779 100644
--- a/java/com/android/dialer/compat/telephony/TelephonyManagerCompat.java
+++ b/java/com/android/dialer/compat/telephony/TelephonyManagerCompat.java
@@ -65,9 +65,6 @@
   public static final String ASSISTED_DIALING_EXTRAS =
       "android.telecom.extra.ASSISTED_DIALING_EXTRAS";
 
-  public static final String EXTRA_ASSISTED_DIALING_TRANSFORMATION_INFO =
-      "android.telecom.extra.ASSISTED_DIALING_TRANSFORMATION_INFO";
-
   /** Indicates the Connection/Call used assisted dialing. */
   public static final int PROPERTY_ASSISTED_DIALING_USED = 1 << 9;
 
@@ -80,10 +77,6 @@
    */
   public static final Integer FEATURES_ASSISTED_DIALING = 1 << 4;
 
-  /** The {@link android.content.Intent} action used to show the assisted dialing settings. */
-  public static final String ACTION_SHOW_ASSISTED_DIALING_SETTINGS =
-      "android.telecom.action.SHOW_ASSISTED_DIALING_SETTINGS";
-
   /**
    * Returns the number of phones available. Returns 1 for Single standby mode (Single SIM
    * functionality) Returns 2 for Dual standby mode.(Dual SIM functionality)
diff --git a/java/com/android/dialer/precall/impl/AssistedDialAction.java b/java/com/android/dialer/precall/impl/AssistedDialAction.java
index 15a889e..9ed37ac 100644
--- a/java/com/android/dialer/precall/impl/AssistedDialAction.java
+++ b/java/com/android/dialer/precall/impl/AssistedDialAction.java
@@ -20,7 +20,6 @@
 import android.content.Context;
 import android.os.Build;
 import android.os.Bundle;
-import android.support.v4.os.BuildCompat;
 import android.telecom.PhoneAccount;
 import android.telephony.SubscriptionInfo;
 import android.telephony.TelephonyManager;
@@ -58,9 +57,7 @@
     AssistedDialingMediator assistedDialingMediator =
         ConcreteCreator.createNewAssistedDialingMediator(
             getAssistedDialingTelephonyManager(context, builder), context);
-    if (BuildCompat.isAtLeastP()) {
-      builder.getOutgoingCallExtras().putBoolean(TelephonyManagerCompat.USE_ASSISTED_DIALING, true);
-    }
+
     // Checks the platform is N+ and meets other pre-flight checks.
     if (!assistedDialingMediator.isPlatformEligible()) {
       return;
diff --git a/java/com/android/incallui/call/DialerCall.java b/java/com/android/incallui/call/DialerCall.java
index 50bc691..d36b00d 100644
--- a/java/com/android/incallui/call/DialerCall.java
+++ b/java/com/android/incallui/call/DialerCall.java
@@ -1136,7 +1136,7 @@
    */
   public boolean isAssistedDialed() {
     if (getIntentExtras() != null) {
-      // O_MR1 and below uses the existence of USE_ASSISTED_DIALING to indicate assisted dialing
+      // P and below uses the existence of USE_ASSISTED_DIALING to indicate assisted dialing
       // was used. The Dialer client is responsible for performing assisted dialing before
       // placing the outgoing call.
       //
@@ -1148,13 +1148,6 @@
       }
     }
 
-    // Starting in P+ USE_ASSISTED_DIALING indicates that the client requested the platform
-    // perform assisted dialing. PROPERTY_ASSISTED_DIALING_USED indicates assisted dialing took
-    // place.
-    if (hasProperty(TelephonyManagerCompat.PROPERTY_ASSISTED_DIALING_USED)
-        && BuildCompat.isAtLeastP()) {
-      return true;
-    }
     return false;
   }
 
@@ -1164,21 +1157,6 @@
       return null;
     }
 
-    if (BuildCompat.isAtLeastP()) {
-      if (getExtras() == null) {
-        return null;
-      }
-
-      if (getExtras()
-              .getParcelable(TelephonyManagerCompat.EXTRA_ASSISTED_DIALING_TRANSFORMATION_INFO)
-          == null) {
-        return null;
-      }
-
-      // TODO(erfanian): Use the framework transformation info when we can link against it
-      return null;
-    }
-
     if (getIntentExtras().getBundle(TelephonyManagerCompat.ASSISTED_DIALING_EXTRAS) == null) {
       return null;
     }