diff --git a/cli/mmcli-output.c b/cli/mmcli-output.c
index 81a402ac..7f68e812 100644
--- a/cli/mmcli-output.c
+++ b/cli/mmcli-output.c
@@ -264,6 +264,7 @@ static FieldInfo field_infos[] = {
     [MMC_F_SMS_PROPERTIES_DELIVERY_STATE]     = { "sms.properties.delivery-state",                   "delivery state",           MMC_S_SMS_PROPERTIES,          },
     [MMC_F_SMS_PROPERTIES_DISCH_TIMESTAMP]    = { "sms.properties.discharge-timestamp",              "discharge timestamp",      MMC_S_SMS_PROPERTIES,          },
     [MMC_F_SIM_GENERAL_DBUS_PATH]             = { "sim.dbus-path",                                   "path",                     MMC_S_SIM_GENERAL,             },
+    [MMC_F_SIM_PROPERTIES_ACTIVE]             = { "sim.properties.active",                           "active",                   MMC_S_SIM_PROPERTIES,          },
     [MMC_F_SIM_PROPERTIES_IMSI]               = { "sim.properties.imsi",                             "imsi",                     MMC_S_SIM_PROPERTIES,          },
     [MMC_F_SIM_PROPERTIES_ICCID]              = { "sim.properties.iccid",                            "iccid",                    MMC_S_SIM_PROPERTIES,          },
     [MMC_F_SIM_PROPERTIES_OPERATOR_ID]        = { "sim.properties.operator-code",                    "operator id",              MMC_S_SIM_PROPERTIES,          },
diff --git a/cli/mmcli-output.h b/cli/mmcli-output.h
index e350b340..0bf40a41 100644
--- a/cli/mmcli-output.h
+++ b/cli/mmcli-output.h
@@ -281,6 +281,7 @@ typedef enum {
     MMC_F_SMS_PROPERTIES_DELIVERY_STATE,
     MMC_F_SMS_PROPERTIES_DISCH_TIMESTAMP,
     MMC_F_SIM_GENERAL_DBUS_PATH,
+    MMC_F_SIM_PROPERTIES_ACTIVE,
     MMC_F_SIM_PROPERTIES_IMSI,
     MMC_F_SIM_PROPERTIES_ICCID,
     MMC_F_SIM_PROPERTIES_OPERATOR_ID,
diff --git a/cli/mmcli-sim.c b/cli/mmcli-sim.c
index efb15df3..e5501ca9 100644
--- a/cli/mmcli-sim.c
+++ b/cli/mmcli-sim.c
@@ -159,6 +159,7 @@ static void
 print_sim_info (MMSim *sim)
 {
     mmcli_output_string       (MMC_F_SIM_GENERAL_DBUS_PATH,            mm_sim_get_path (sim));
+    mmcli_output_string       (MMC_F_SIM_PROPERTIES_ACTIVE,            mm_sim_get_active (sim) ? "yes" : "no");
     mmcli_output_string       (MMC_F_SIM_PROPERTIES_IMSI,              mm_sim_get_imsi (sim));
     mmcli_output_string       (MMC_F_SIM_PROPERTIES_ICCID,             mm_sim_get_identifier (sim));
     mmcli_output_string       (MMC_F_SIM_PROPERTIES_OPERATOR_ID,       mm_sim_get_operator_identifier (sim));
diff --git a/docs/reference/libmm-glib/libmm-glib-sections.txt b/docs/reference/libmm-glib/libmm-glib-sections.txt
index 32524e7a..3ffd8c87 100644
--- a/docs/reference/libmm-glib/libmm-glib-sections.txt
+++ b/docs/reference/libmm-glib/libmm-glib-sections.txt
@@ -1209,6 +1209,7 @@ MMSim
 <SUBSECTION Getters>
 mm_sim_get_path
 mm_sim_dup_path
+mm_sim_get_active
 mm_sim_get_identifier
 mm_sim_dup_identifier
 mm_sim_get_imsi
@@ -3088,6 +3089,7 @@ mm_gdbus_object_manager_client_get_type
 MmGdbusSim
 MmGdbusSimIface
 <SUBSECTION Getters>
+mm_gdbus_sim_get_active
 mm_gdbus_sim_get_imsi
 mm_gdbus_sim_dup_imsi
 mm_gdbus_sim_get_sim_identifier
@@ -3112,6 +3114,7 @@ mm_gdbus_sim_call_change_pin
 mm_gdbus_sim_call_change_pin_finish
 mm_gdbus_sim_call_change_pin_sync
 <SUBSECTION Private>
+mm_gdbus_sim_set_active
 mm_gdbus_sim_set_imsi
 mm_gdbus_sim_set_operator_identifier
 mm_gdbus_sim_set_operator_name
diff --git a/introspection/org.freedesktop.ModemManager1.Sim.xml b/introspection/org.freedesktop.ModemManager1.Sim.xml
index ceba2629..f214ba5f 100644
--- a/introspection/org.freedesktop.ModemManager1.Sim.xml
+++ b/introspection/org.freedesktop.ModemManager1.Sim.xml
@@ -65,6 +65,19 @@
       <arg name="new_pin" type="s" direction="in" />
     </method>
 
+    <!--
+        Active:
+
+        Boolean indicating whether the SIM is currently active.
+
+        On systems that support Multi SIM Single Standby, only one SIM may be
+        active at any given time, which will be the one considered primary.
+
+        On systems that support Multi SIM Multi Standby, more than one SIM may
+        be active at any given time, but only one of them is considered primary.
+    -->
+    <property name="Active" type="b" access="read" />
+
     <!--
         SimIdentifier:
 
diff --git a/libmm-glib/mm-sim.c b/libmm-glib/mm-sim.c
index 7246fff4..d59f7990 100644
--- a/libmm-glib/mm-sim.c
+++ b/libmm-glib/mm-sim.c
@@ -86,6 +86,26 @@ mm_sim_dup_path (MMSim *self)
 
 /*****************************************************************************/
 
+/**
+ * mm_sim_get_active:
+ * @self: A #MMSim.
+ *
+ * Checks whether the #MMSim is currently active.
+ *
+ * Returns: %TRUE if the SIM is active, %FALSE otherwise.
+ *
+ * Since: 1.16
+ */
+gboolean
+mm_sim_get_active (MMSim *self)
+{
+    g_return_val_if_fail (MM_IS_SIM (self), FALSE);
+
+    return mm_gdbus_sim_get_active (MM_GDBUS_SIM (self));
+}
+
+/*****************************************************************************/
+
 /**
  * mm_sim_get_identifier:
  * @self: A #MMSim.
diff --git a/libmm-glib/mm-sim.h b/libmm-glib/mm-sim.h
index eee4bc49..efafea45 100644
--- a/libmm-glib/mm-sim.h
+++ b/libmm-glib/mm-sim.h
@@ -67,6 +67,8 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC (MMSim, g_object_unref)
 const gchar *mm_sim_get_path                (MMSim *self);
 gchar       *mm_sim_dup_path                (MMSim *self);
 
+gboolean     mm_sim_get_active              (MMSim *self);
+
 const gchar *mm_sim_get_identifier          (MMSim *self);
 gchar       *mm_sim_dup_identifier          (MMSim *self);
 
diff --git a/plugins/huawei/mm-sim-huawei.c b/plugins/huawei/mm-sim-huawei.c
index 54b388b3..f937c773 100644
--- a/plugins/huawei/mm-sim-huawei.c
+++ b/plugins/huawei/mm-sim-huawei.c
@@ -148,6 +148,7 @@ mm_sim_huawei_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/iridium/mm-sim-iridium.c b/plugins/iridium/mm-sim-iridium.c
index 1240e6af..1d9af32a 100644
--- a/plugins/iridium/mm-sim-iridium.c
+++ b/plugins/iridium/mm-sim-iridium.c
@@ -63,6 +63,7 @@ mm_sim_iridium_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/mbm/mm-sim-mbm.c b/plugins/mbm/mm-sim-mbm.c
index 1b160d6c..d3f73954 100644
--- a/plugins/mbm/mm-sim-mbm.c
+++ b/plugins/mbm/mm-sim-mbm.c
@@ -221,6 +221,7 @@ mm_sim_mbm_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/nokia/mm-sim-nokia.c b/plugins/nokia/mm-sim-nokia.c
index 043d6349..a0d7c81a 100644
--- a/plugins/nokia/mm-sim-nokia.c
+++ b/plugins/nokia/mm-sim-nokia.c
@@ -62,6 +62,7 @@ mm_sim_nokia_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/novatel/mm-sim-novatel-lte.c b/plugins/novatel/mm-sim-novatel-lte.c
index 676db569..4d71bd80 100644
--- a/plugins/novatel/mm-sim-novatel-lte.c
+++ b/plugins/novatel/mm-sim-novatel-lte.c
@@ -215,6 +215,7 @@ mm_sim_novatel_lte_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/pantech/mm-sim-pantech.c b/plugins/pantech/mm-sim-pantech.c
index 0cf61e97..33414572 100644
--- a/plugins/pantech/mm-sim-pantech.c
+++ b/plugins/pantech/mm-sim-pantech.c
@@ -62,6 +62,7 @@ mm_sim_pantech_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/sierra/mm-sim-sierra.c b/plugins/sierra/mm-sim-sierra.c
index d81e82b2..2f3caa48 100644
--- a/plugins/sierra/mm-sim-sierra.c
+++ b/plugins/sierra/mm-sim-sierra.c
@@ -139,6 +139,7 @@ mm_sim_sierra_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/plugins/ublox/mm-sim-ublox.c b/plugins/ublox/mm-sim-ublox.c
index 0e8006cc..5850767e 100644
--- a/plugins/ublox/mm-sim-ublox.c
+++ b/plugins/ublox/mm-sim-ublox.c
@@ -144,6 +144,7 @@ mm_sim_ublox_new (MMBaseModem          *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/src/mm-base-sim.c b/src/mm-base-sim.c
index 27759532..0a91d385 100644
--- a/src/mm-base-sim.c
+++ b/src/mm-base-sim.c
@@ -1715,6 +1715,7 @@ mm_base_sim_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/src/mm-sim-mbim.c b/src/mm-sim-mbim.c
index f48bb31d..2619687a 100644
--- a/src/mm-sim-mbim.c
+++ b/src/mm-sim-mbim.c
@@ -752,6 +752,7 @@ mm_sim_mbim_new (MMBaseModem *modem,
                                 callback,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }
 
diff --git a/src/mm-sim-qmi.c b/src/mm-sim-qmi.c
index 6eb5854d..584dbe99 100644
--- a/src/mm-sim-qmi.c
+++ b/src/mm-sim-qmi.c
@@ -1315,6 +1315,7 @@ mm_sim_qmi_new (MMBaseModem         *modem,
                                 user_data,
                                 MM_BASE_SIM_MODEM, modem,
                                 MM_SIM_QMI_DMS_UIM_DEPRECATED, dms_uim_deprecated,
+                                "active", TRUE, /* by default always active */
                                 NULL);
 }