diff --git a/ril/v1_4/IRil.idl b/ril/v1_4/IRil.idl
index 6ee8b700439b4074e22ac344bc103e5bca041fec..0df7715ed7895f9e589f0733244250fb75382e49 100644
--- a/ril/v1_4/IRil.idl
+++ b/ril/v1_4/IRil.idl
@@ -162,5 +162,33 @@ interface IRil extends ohos.hdi.ril.v1_3.IRil {
     */
     [oneway] ActivatePdpContextWithApnTypesforSlice([in] int slotId, [in] int serialId,
         [in] struct DataCallInfoWithApnTypesforSlice dataCallInfo);
+
+    /**
+    * @brief Get the data service main card slot
+    *
+    * @param slotId Card slot ID.
+    * @param serialId Serial ID of a request.
+    *
+    * @return Returns <b>0</b> if the operation is successful.
+    * @return Returns a non-0 value if the operation fails.
+    *
+    * @since 6.0
+    * @version 1.0
+    */
+    [oneway] GetPrimarySlot([in] int slotId, [in] int serialId);
+
+    /**
+    * @brief Set the data service main card slot when the modem does not require a software power on/off.
+    *
+    * @param slotId Card slot ID.
+    * @param serialId Serial ID of a request.
+    *
+    * @return Returns <b>0</b> if the operation is successful.
+    * @return Returns a non-0 value if the operation fails.
+    *
+    * @since 6.0
+    * @version 1.0
+    */
+    [oneway] SetPrimarySlot([in] int slotId, [in] int serialId);    
 }
 /** @} */
diff --git a/ril/v1_4/IRilCallback.idl b/ril/v1_4/IRilCallback.idl
index ae9f00fe8dd90d7e9fd21c2f5da9f5201fab1d1d..5ff6560adfdeda11bc518d7e9c1514e23993d0fe 100644
--- a/ril/v1_4/IRilCallback.idl
+++ b/ril/v1_4/IRilCallback.idl
@@ -107,5 +107,29 @@ import ohos.hdi.ril.v1_4.Types;
      */
     [oneway] NetworkSliceEhplmnRpt([in] struct RilRadioResponseInfo responseInfo,
         [in] struct NetworkSliceEhplmnInfo networksliceEhplmnInfo);
+
+    /**
+     * @brief Callback for the response of getting the data service main card slot
+     *
+     * @param responseInfo Common response information, such as the card slot ID and request sequence ID.
+     * For details, see {@link RilRadioResponseInfo}.
+     * @param primarySlotId.
+     *
+     * @since 6.0
+     * @version 1.0
+     */
+    [oneway] GetPrimarySlotResponse([in] struct RilRadioResponseInfo responseInfo, [in] int primarySlotId);
+
+    /**
+     * @brief Callback for the response of setting the data service main card slot when the modem does not require a 
+     * software power on/off.
+     *
+     * @param responseInfo Common response information, such as the card slot ID and request sequence ID.
+     * For details, see {@link RilRadioResponseInfo}.
+     *
+     * @since 6.0
+     * @version 1.0
+     */
+    [oneway] SetPrimarySlotResponse([in] struct RilRadioResponseInfo responseInfo);
 }
 /** @} */
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