diff --git a/api/system-current.txt b/api/system-current.txt
index 8c78b21eee5c7..4ff35585cf8af 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -8352,6 +8352,7 @@ package android.telephony.euicc {
     field public static final String EXTRA_EMBEDDED_SUBSCRIPTION_DOWNLOADABLE_SUBSCRIPTIONS = "android.telephony.euicc.extra.EMBEDDED_SUBSCRIPTION_DOWNLOADABLE_SUBSCRIPTIONS";
     field public static final String EXTRA_ENABLE_SUBSCRIPTION = "android.telephony.euicc.extra.ENABLE_SUBSCRIPTION";
     field public static final String EXTRA_FORCE_PROVISION = "android.telephony.euicc.extra.FORCE_PROVISION";
+    field public static final String EXTRA_FROM_SUBSCRIPTION_ID = "android.telephony.euicc.extra.FROM_SUBSCRIPTION_ID";
     field public static final String EXTRA_SUBSCRIPTION_ID = "android.telephony.euicc.extra.SUBSCRIPTION_ID";
     field public static final String EXTRA_SUBSCRIPTION_NICKNAME = "android.telephony.euicc.extra.SUBSCRIPTION_NICKNAME";
   }
diff --git a/telephony/java/android/telephony/euicc/EuiccManager.java b/telephony/java/android/telephony/euicc/EuiccManager.java
index 875bd782d2cb1..cde10ea7cd090 100644
--- a/telephony/java/android/telephony/euicc/EuiccManager.java
+++ b/telephony/java/android/telephony/euicc/EuiccManager.java
@@ -118,9 +118,9 @@ public class EuiccManager {
     /**
      * Intent action sent by system apps (such as the Settings app) to the Telephony framework to
      * enable or disable a subscription. Must be accompanied with {@link #EXTRA_SUBSCRIPTION_ID} and
-     * {@link #EXTRA_ENABLE_SUBSCRIPTION}.
+     * {@link #EXTRA_ENABLE_SUBSCRIPTION}, and optionally {@link #EXTRA_FROM_SUBSCRIPTION_ID}.
      *
-     * Requires the caller to be a privileged process with the
+     * <p>Requires the caller to be a privileged process with the
      * {@link android.permission#CALL_PRIVILEGED} permission for the intent to reach the Telephony
      * stack.
      *
@@ -143,7 +143,7 @@ public class EuiccManager {
      * Intent action sent by system apps (such as the Settings app) to the Telephony framework to
      * delete a subscription. Must be accompanied with {@link #EXTRA_SUBSCRIPTION_ID}.
      *
-     * Requires the caller to be a privileged process with the
+     * <p>Requires the caller to be a privileged process with the
      * {@link android.permission#CALL_PRIVILEGED} permission for the intent to reach the Telephony
      * stack.
      *
@@ -167,7 +167,7 @@ public class EuiccManager {
      * rename a subscription. Must be accompanied with {@link #EXTRA_SUBSCRIPTION_ID} and
      * {@link #EXTRA_SUBSCRIPTION_NICKNAME}.
      *
-     * Requires the caller to be a privileged process with the
+     * <p>Requires the caller to be a privileged process with the
      * {@link android.permission#CALL_PRIVILEGED} permission for the intent to reach the Telephony
      * stack.
      *
@@ -317,6 +317,22 @@ public class EuiccManager {
     public static final String EXTRA_SUBSCRIPTION_NICKNAME =
             "android.telephony.euicc.extra.SUBSCRIPTION_NICKNAME";
 
+    /**
+     * Key for an extra set on {@link #ACTION_TOGGLE_SUBSCRIPTION_PRIVILEGED} providing the ID of
+     * the subscription we're toggling from. This extra is optional and is only used for UI
+     * purposes by the underlying eUICC service (i.e. the LPA app), such as displaying a dialog
+     * titled "Switch X with Y". If set, the provided subscription will be used as the "from"
+     * subscription in UI (the "X" in the dialog example). Otherwise, the currently active
+     * subscription that will be disabled is the "from" subscription.
+     *
+     * <p>Expected type of the extra data: int
+     *
+     * @hide
+     */
+    @SystemApi
+    public static final String EXTRA_FROM_SUBSCRIPTION_ID =
+            "android.telephony.euicc.extra.FROM_SUBSCRIPTION_ID";
+
     /**
      * Optional meta-data attribute for a carrier app providing an icon to use to represent the
      * carrier. If not provided, the app's launcher icon will be used as a fallback.