2 files changed, 15 insertions, 3 deletions
diff --git a/java/com/android/dialer/preferredsim/PreferredSimFallbackContract.java b/java/com/android/dialer/preferredsim/PreferredSimFallbackContract.java
index 79e097c47..6c2f860e6 100644
--- a/java/com/android/dialer/preferredsim/PreferredSimFallbackContract.java
+++ b/java/com/android/dialer/preferredsim/PreferredSimFallbackContract.java
@@ -24,9 +24,11 @@ import com.android.dialer.constants.Constants;
 
 /**
  * Extend fields for preferred SIM that is not available in {@link
- * android.provider.ContactsContract.Data} before P. Only query and update is supported for this
- * provider, and the update selection must be {@link PreferredSim#UPDATE_ID_SELECTION}. Caller must
- * have {@link android.Manifest.permission#READ_CONTACTS} to read or {@link
+ * android.provider.ContactsContract.Data} before P. Insert is not supported for this provider. The
+ * update selection must be "data_id = ?". Delete is only supported directly on {@link #CONTENT_URI}
+ * with {@code null} selection, which clears all preferences.
+ *
+ * <p>Caller must have {@link android.Manifest.permission#READ_CONTACTS} to read or {@link
  * android.Manifest.permission#WRITE_CONTACTS} to write.
  */
 public final class PreferredSimFallbackContract {
diff --git a/java/com/android/dialer/preferredsim/impl/PreferredSimFallbackProvider.java b/java/com/android/dialer/preferredsim/impl/PreferredSimFallbackProvider.java
index 1b10765a5..2263e9e38 100644
--- a/java/com/android/dialer/preferredsim/impl/PreferredSimFallbackProvider.java
+++ b/java/com/android/dialer/preferredsim/impl/PreferredSimFallbackProvider.java
@@ -91,6 +91,16 @@ public class PreferredSimFallbackProvider extends ContentProvider {
   @Override
   public int delete(
       @NonNull Uri uri, @Nullable String selection, @Nullable String[] selectionArgs) {
+    checkWriteContactsPermission();
+
+    if (PreferredSimFallbackContract.CONTENT_URI.equals(uri)
+        && selection == null
+        && selectionArgs == null) {
+      return databaseHelper
+          .getWritableDatabase()
+          .delete(PreferredSimDatabaseHelper.TABLE, null, null);
+    }
+
     if (!TextUtils.equals(getContext().getPackageName(), getCallingPackage())) {
       throw new IllegalArgumentException("Unsupported operation");
     }