diff --git a/radio/1.0/types.hal b/radio/1.0/types.hal
index 025aa7c..cafa5a6 100644
--- a/radio/1.0/types.hal
+++ b/radio/1.0/types.hal
@@ -166,11 +166,15 @@
 };
 
 enum CardState : int32_t {
+    /* card is physically absent from device. (Some old modems use CardState.ABSENT when the SIM
+       is powered off. This is no longer correct, however the platform will still support this
+       legacy behavior.) */
     ABSENT,
+    /* card is inserted in the device */
     PRESENT,
     ERROR,
-    RESTRICTED,                           // card is present but not usable due to carrier
-                                          // restrictions
+    /* card is present but not usable due to carrier restrictions */
+    RESTRICTED,
 };
 
 enum PinState : int32_t {
diff --git a/radio/1.6/IRadio.hal b/radio/1.6/IRadio.hal
index ca40a17..66007b4 100644
--- a/radio/1.6/IRadio.hal
+++ b/radio/1.6/IRadio.hal
@@ -19,6 +19,7 @@
 
 import @1.0::CdmaSmsMessage;
 import @1.0::GsmSmsMessage;
+import @1.1::CardPowerState;
 import @1.2::DataRequestReason;
 import @1.5::IRadio;
 import @1.5::AccessNetwork;
@@ -183,6 +184,42 @@
     oneway sendCdmaSmsExpectMore_1_6(int32_t serial, CdmaSmsMessage sms);
 
     /**
+     * Set SIM card power state.
+     * Request is used to power off or power on the card. It should not generate
+     * a CardState.CARDSTATE_ABSENT indication, since the SIM is still physically
+     * inserted.
+     *
+     * @param serial Serial number of request
+     * @param powerUp POWER_DOWN if powering down the SIM card,
+     *                POWER_UP if powering up the SIM card,
+     *                POWER_UP_PASS_THROUGH if powering up the SIM card in
+     *                                      pass through mode.
+     *
+     * When SIM card is in POWER_UP_PASS_THROUGH, the modem does not send
+     * any command to it (for example SELECT of MF, or TERMINAL
+     * CAPABILITY), and the SIM card is controlled completely by Telephony
+     * sending APDUs directly. The SIM card state must be
+     * RIL_CARDSTATE_PRESENT and the number of card apps will be 0.
+     * No new error code is generated. Emergency calls are supported in
+     * the same way as if the SIM card is absent.
+     * Pass-through mode is valid only for the specific card session where
+     * it is activated, and normal behavior occurs at the next SIM
+     * initialization, unless POWER_UP_PASS_THROUGH is requested again.
+     *
+     * The device is required to power down the SIM card before it can
+     * switch the mode between POWER_UP and POWER_UP_PASS_THROUGH.
+     * At device power up, the SIM interface is powered up automatically.
+     * Each subsequent request to this method is processed only after the
+     * completion of the previous one.
+     *
+     * Response callback is IRadioResponse.setSimCardPowerResponse_1_6().
+     * Note that this differs from setSimCardPower_1_1 in that the response
+     * callback should only be sent once the device has finished executing
+     * the request (the SIM has finished powering on or off).
+     */
+    oneway setSimCardPower_1_6(int32_t serial, CardPowerState powerUp);
+
+    /**
      * Enable or disable E-UTRA-NR dual connectivity. If disabled then UE will not connect
      * to secondary carrier.
      *
diff --git a/radio/1.6/IRadioResponse.hal b/radio/1.6/IRadioResponse.hal
index 4ff7e47..bc6db11 100644
--- a/radio/1.6/IRadioResponse.hal
+++ b/radio/1.6/IRadioResponse.hal
@@ -207,6 +207,22 @@
      * Valid errors returned:
      *   RadioError:NONE
      *   RadioError:RADIO_NOT_AVAILABLE
+     *   RadioError:REQUEST_NOT_SUPPORTED
+     *   RadioError:INVALID_ARGUMENTS
+     *   RadioError:SIM_ERR (indicates a timeout or other issue making the SIM unresponsive)
+     *
+     * Note that this differs from setSimCardPowerResponse_1_1 in that the response
+     * should only be sent once the request from setSimCardPower_1_6 is complete
+     * (the SIM has finished powering on or off).
+     */
+    oneway setSimCardPowerResponse_1_6(RadioResponseInfo info);
+
+    /**
+     * @param info Response info struct containing response type, serial no. and error
+     *
+     * Valid errors returned:
+     *   RadioError:NONE
+     *   RadioError:RADIO_NOT_AVAILABLE
      *   RadioError:INTERNAL_ERR
      */
     oneway enableNrDualConnectivityResponse(RadioResponseInfo info);
diff --git a/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h b/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
index 784bcd9..553e5b7 100644
--- a/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
+++ b/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
@@ -763,6 +763,9 @@
             const ::android::hardware::radio::V1_6::RadioResponseInfo& info,
             const SendSmsResult& sms);
 
+    Return<void> setSimCardPowerResponse_1_6(
+            const ::android::hardware::radio::V1_6::RadioResponseInfo& info);
+
     Return<void> sendCdmaSmsExpectMoreResponse_1_6(
             const ::android::hardware::radio::V1_6::RadioResponseInfo& info,
             const SendSmsResult& sms);
diff --git a/radio/1.6/vts/functional/radio_response.cpp b/radio/1.6/vts/functional/radio_response.cpp
index ffa384e..c684584 100644
--- a/radio/1.6/vts/functional/radio_response.cpp
+++ b/radio/1.6/vts/functional/radio_response.cpp
@@ -1097,6 +1097,13 @@
     return Void();
 }
 
+Return<void> RadioResponse_v1_6::setSimCardPowerResponse_1_6(
+        const ::android::hardware::radio::V1_6::RadioResponseInfo& info) {
+    rspInfo = info;
+    parent_v1_6.notify(info.serial);
+    return Void();
+}
+
 Return<void> RadioResponse_v1_6::sendCdmaSmsExpectMoreResponse_1_6(
         const ::android::hardware::radio::V1_6::RadioResponseInfo& info,
         const SendSmsResult& sms) {