diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 8e99a25..88b4443 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -7848,7 +7848,7 @@
                 if (!localeFromDefaultSim.getCountry().isEmpty()) {
                     if (DBG) log("Using locale from subId: " + subId + " locale: "
                             + localeFromDefaultSim);
-                    return matchLocaleFromSupportedLocaleList(phone, localeFromDefaultSim);
+                    return matchLocaleFromSupportedLocaleList(localeFromDefaultSim);
                 } else {
                     simLanguage = localeFromDefaultSim.getLanguage();
                 }
@@ -7861,7 +7861,7 @@
             final Locale mccLocale = LocaleUtils.getLocaleFromMcc(mApp, mcc, simLanguage);
             if (mccLocale != null) {
                 if (DBG) log("No locale from SIM, using mcc locale:" + mccLocale);
-                return matchLocaleFromSupportedLocaleList(phone, localeFromDefaultSim);
+                return matchLocaleFromSupportedLocaleList(mccLocale);
             }
 
             if (DBG) log("No locale found - returning null");
@@ -7872,9 +7872,9 @@
     }
 
     @VisibleForTesting
-    String matchLocaleFromSupportedLocaleList(Phone phone, @NonNull Locale inputLocale) {
+    String matchLocaleFromSupportedLocaleList(@NonNull Locale inputLocale) {
         String[] supportedLocale = com.android.internal.app.LocalePicker.getSupportedLocales(
-                phone.getContext());
+                getDefaultPhone().getContext());
         for (String localeTag : supportedLocale) {
             if (LocaleList.matchesLanguageAndScript(
                     inputLocale, Locale.forLanguageTag(localeTag))
diff --git a/tests/src/com/android/phone/PhoneInterfaceManagerTest.java b/tests/src/com/android/phone/PhoneInterfaceManagerTest.java
index b623bd0..ffc0177 100644
--- a/tests/src/com/android/phone/PhoneInterfaceManagerTest.java
+++ b/tests/src/com/android/phone/PhoneInterfaceManagerTest.java
@@ -17,16 +17,11 @@
 package com.android.phone;
 
 import static org.junit.Assert.assertEquals;
-import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
 
-import android.content.Context;
 import android.content.pm.PackageManager;
-import android.content.res.Resources;
 import android.telephony.RadioAccessFamily;
 import android.telephony.TelephonyManager;
 
@@ -96,22 +91,14 @@
 
     @Test
     public void matchLocaleFromSupportedLocaleList_inputLocaleChangeToSupportedLocale() {
-        Context context = mock(Context.class);
-        Resources resources = mock(Resources.class);
-        when(mPhone.getContext()).thenReturn(context);
-        when(context.getResources()).thenReturn(resources);
-        when(resources.getStringArray(anyInt())).thenReturn(new String[]{"zh-Hant-TW"});
         // Input zh-TW, then look up the matched supported locale, zh-Hant-TW, instead.
-        String result1 = mPhoneInterfaceManager.matchLocaleFromSupportedLocaleList(mPhone,
+        String result1 = mPhoneInterfaceManager.matchLocaleFromSupportedLocaleList(
                 Locale.forLanguageTag("zh-TW"));
 
         assertEquals(result1, "zh-Hant-TW");
 
-        when(resources.getStringArray(anyInt())).thenReturn(
-                new String[]{"fi-FI", "ff-Adlm-BF", "ff-Latn-BF"});
-
         // Input ff-BF, then find the matched supported locale, ff-Latn-BF, instead.
-        String result2 = mPhoneInterfaceManager.matchLocaleFromSupportedLocaleList(mPhone,
+        String result2 = mPhoneInterfaceManager.matchLocaleFromSupportedLocaleList(
                 Locale.forLanguageTag("ff-BF"));
 
         assertEquals(result2, "ff-Latn-BF");