diff --git a/src/com/android/phone/settings/TtyModeListPreference.java b/src/com/android/phone/settings/TtyModeListPreference.java
index 89cac47..ba415c5 100644
--- a/src/com/android/phone/settings/TtyModeListPreference.java
+++ b/src/com/android/phone/settings/TtyModeListPreference.java
@@ -18,17 +18,23 @@
 
 import android.content.Context;
 import android.content.Intent;
+import android.os.PersistableBundle;
 import android.os.UserHandle;
 import android.preference.ListPreference;
 import android.preference.Preference;
 import android.provider.Settings;
+import android.provider.Settings.Secure;
 import android.telecom.TelecomManager;
+import android.telephony.CarrierConfigManager;
+import android.telephony.SubscriptionManager;
 import android.util.AttributeSet;
 import android.util.Log;
 
 import com.android.phone.PhoneGlobals;
 import com.android.phone.R;
 
+import java.util.Arrays;
+
 public class TtyModeListPreference extends ListPreference
         implements Preference.OnPreferenceChangeListener {
     private static final String LOG_TAG = TtyModeListPreference.class.getSimpleName();
@@ -44,6 +50,19 @@
         int settingsTtyMode = Settings.Secure.getInt(getContext().getContentResolver(),
                 Settings.Secure.PREFERRED_TTY_MODE,
                 TelecomManager.TTY_MODE_OFF);
+        if (shouldHideHcoAndVco()) {
+            setEntries(Arrays.copyOfRange(
+                    getContext().getResources().getTextArray(R.array.tty_mode_entries), 0, 2));
+            setEntryValues(Arrays.copyOfRange(
+                    getContext().getResources().getTextArray(R.array.tty_mode_values), 0, 2));
+            if (settingsTtyMode == TelecomManager.TTY_MODE_HCO
+                    || settingsTtyMode == TelecomManager.TTY_MODE_VCO) {
+                // If the persisted setting is HCO or VCO, set it to full here
+                settingsTtyMode = TelecomManager.TTY_MODE_FULL;
+                Settings.Secure.putInt(getContext().getContentResolver(), Secure.PREFERRED_TTY_MODE,
+                        settingsTtyMode);
+            }
+        }
         setValue(Integer.toString(settingsTtyMode));
         updatePreferredTtyModeSummary(settingsTtyMode);
     }
@@ -101,6 +120,18 @@
         }
     }
 
+    private boolean shouldHideHcoAndVco() {
+        CarrierConfigManager carrierConfigManager =
+                getContext().getSystemService(CarrierConfigManager.class);
+        PersistableBundle config = carrierConfigManager.getConfigForSubId(
+                SubscriptionManager.getDefaultVoiceSubscriptionId());
+        boolean carrierShouldHideHcoVco = config != null && config.getBoolean(
+                CarrierConfigManager.KEY_HIDE_TTY_HCO_VCO_WITH_RTT_BOOL, false);
+        boolean isRttSupported = PhoneGlobals.getInstance().phoneMgr.isRttSupported(
+                SubscriptionManager.getDefaultVoiceSubscriptionId());
+        return carrierShouldHideHcoVco && isRttSupported;
+    }
+
     private static void log(String msg) {
         Log.d(LOG_TAG, msg);
     }