diff --git a/api/@ohos.telephony.data.d.ts b/api/@ohos.telephony.data.d.ts
index a82b90e3dd203f02940c831c92af55e69c970de6..1ca3ce823f77aed38d4cfc72243670bd0c3022db 100644
--- a/api/@ohos.telephony.data.d.ts
+++ b/api/@ohos.telephony.data.d.ts
@@ -31,6 +31,17 @@ declare namespace data {
   function getDefaultCellularDataSlotId(callback: AsyncCallback<number>): void;
   function getDefaultCellularDataSlotId(): Promise<number>;
 
+  /**
+   * Checks whether cellular data services are enabled.
+   *
+   * <p>Requires Permission: {@code ohos.permission.GET_NETWORK_INFO}.
+   *
+   * @return Returns default cellular data slot id.
+   * @permission ohos.permission.GET_NETWORK_INFO
+   * @since 9
+   */
+  function getDefaultCellularDataSlotIdSync(): number;
+
   /**
    * Switches cellular data services to another card, without changing the default settings.
    *