diff --git a/docs/reference/libmm-glib/libmm-glib-sections.txt b/docs/reference/libmm-glib/libmm-glib-sections.txt
index 92d25bc8..c9d9b0fd 100644
--- a/docs/reference/libmm-glib/libmm-glib-sections.txt
+++ b/docs/reference/libmm-glib/libmm-glib-sections.txt
@@ -162,6 +162,7 @@ mm_modem_peek_unlock_retries
 mm_modem_get_unlock_retries
 mm_modem_get_max_bearers
 mm_modem_get_max_active_bearers
+mm_modem_get_max_active_multiplexed_bearers
 mm_modem_get_bearer_paths
 mm_modem_dup_bearer_paths
 mm_modem_get_own_numbers
@@ -2105,6 +2106,7 @@ mm_gdbus_modem_dup_equipment_identifier
 mm_gdbus_modem_get_manufacturer
 mm_gdbus_modem_dup_manufacturer
 mm_gdbus_modem_get_max_active_bearers
+mm_gdbus_modem_get_max_active_multiplexed_bearers
 mm_gdbus_modem_get_max_bearers
 mm_gdbus_modem_get_model
 mm_gdbus_modem_dup_model
@@ -2193,6 +2195,7 @@ mm_gdbus_modem_set_drivers
 mm_gdbus_modem_set_equipment_identifier
 mm_gdbus_modem_set_manufacturer
 mm_gdbus_modem_set_max_active_bearers
+mm_gdbus_modem_set_max_active_multiplexed_bearers
 mm_gdbus_modem_set_max_bearers
 mm_gdbus_modem_set_model
 mm_gdbus_modem_set_own_numbers
diff --git a/introspection/org.freedesktop.ModemManager1.Modem.xml b/introspection/org.freedesktop.ModemManager1.Modem.xml
index d75f86fc..6accaf29 100644
--- a/introspection/org.freedesktop.ModemManager1.Modem.xml
+++ b/introspection/org.freedesktop.ModemManager1.Modem.xml
@@ -351,14 +351,28 @@
 
         The maximum number of active
         <link linkend="MM-BEARER-TYPE-DEFAULT:CAPS"><constant>MM_BEARER_TYPE_DEFAULT</constant></link>
-        bearers that may be explicitly enabled by the user.
+        bearers that may be explicitly enabled by the user without multiplexing support.
 
         POTS and CDMA2000-only devices support one active bearer, while GSM/UMTS
-        and LTE-capable devices (including LTE/CDMA devices) typically support
-        at least two active bearers.
+        and LTE/5GNR capable devices (including 3GPP+3GPP3 multimode devices) may support
+        one or more active bearers, depending on the amount of physical ports exposed
+        by the device.
     -->
     <property name="MaxActiveBearers" type="u" access="read" />
 
+    <!--
+        MaxActiveMultiplexedBearers:
+
+        The maximum number of active
+        <link linkend="MM-BEARER-TYPE-DEFAULT:CAPS"><constant>MM_BEARER_TYPE_DEFAULT</constant></link>
+        bearers that may be explicitly enabled by the user with multiplexing support
+        on one single network interface.
+
+        If the modem doesn't support multiplexing of data sessiones, a value of 0 will
+        be reported.
+    -->
+    <property name="MaxActiveMultiplexedBearers" type="u" access="read" />
+
     <!--
         Manufacturer:
 
diff --git a/libmm-glib/mm-modem.c b/libmm-glib/mm-modem.c
index e3b29bb5..02e322dd 100644
--- a/libmm-glib/mm-modem.c
+++ b/libmm-glib/mm-modem.c
@@ -436,13 +436,15 @@ mm_modem_get_max_bearers (MMModem *self)
  * mm_modem_get_max_active_bearers:
  * @self: a #MMModem.
  *
- * Gets the maximum number of active packet data bearers this #MMModem supports.
+ * Gets the maximum number of active packet data bearers this #MMModem supports
+ * without enabling multiplexing support.
  *
  * POTS and CDMA2000-only devices support one active bearer, while GSM/UMTS
- * and LTE-capable devices (including LTE/CDMA devices) typically support
- * at least two active bearers.
+ * and LTE/5GNR capable devices (including 3GPP+3GPP3 multimode devices) may support
+ * one or more active bearers, depending on the amount of physical ports exposed
+ * by the device.
  *
- * Returns: the maximum number of defined packet data bearers.
+ * Returns: the maximum number of active packet data bearers.
  *
  * Since: 1.0
  */
@@ -456,6 +458,28 @@ mm_modem_get_max_active_bearers (MMModem *self)
 
 /*****************************************************************************/
 
+/**
+ * mm_modem_get_max_active_multiplexed_bearers:
+ * @self: a #MMModem.
+ *
+ * Gets the maximum number of active packet data bearers this #MMModem supports
+ * after enabling multiplexing support on one single network interface.
+ *
+ * Returns: the maximum number of active packet data bearers, or 0 if
+ * multiplexing is not supported.
+ *
+ * Since: 1.18
+ */
+guint
+mm_modem_get_max_active_multiplexed_bearers (MMModem *self)
+{
+    g_return_val_if_fail (MM_IS_MODEM (self), 0);
+
+    return mm_gdbus_modem_get_max_active_multiplexed_bearers (MM_GDBUS_MODEM (self));
+}
+
+/*****************************************************************************/
+
 /**
  * mm_modem_get_bearer_paths:
  * @self: A #MMModem.
diff --git a/libmm-glib/mm-modem.h b/libmm-glib/mm-modem.h
index 589ddafa..ee1f7879 100644
--- a/libmm-glib/mm-modem.h
+++ b/libmm-glib/mm-modem.h
@@ -94,7 +94,8 @@ G_DEPRECATED
 guint              mm_modem_get_max_bearers          (MMModem *self);
 #endif /* MM_DISABLE_DEPRECATED */
 
-guint              mm_modem_get_max_active_bearers   (MMModem *self);
+guint              mm_modem_get_max_active_bearers             (MMModem *self);
+guint              mm_modem_get_max_active_multiplexed_bearers (MMModem *self);
 
 const gchar * const *mm_modem_get_bearer_paths       (MMModem *self);
 gchar              **mm_modem_dup_bearer_paths       (MMModem *self);
diff --git a/src/mm-bearer-list.c b/src/mm-bearer-list.c
index 8bf6ae05..b0694588 100644
--- a/src/mm-bearer-list.c
+++ b/src/mm-bearer-list.c
@@ -35,6 +35,7 @@ enum {
     PROP_0,
     PROP_NUM_BEARERS,
     PROP_MAX_ACTIVE_BEARERS,
+    PROP_MAX_ACTIVE_MULTIPLEXED_BEARERS,
     PROP_LAST
 };
 
@@ -45,6 +46,7 @@ struct _MMBearerListPrivate {
     GList *bearers;
     /* Max number of active bearers */
     guint max_active_bearers;
+    guint max_active_multiplexed_bearers;
 };
 
 /*****************************************************************************/
@@ -55,6 +57,12 @@ mm_bearer_list_get_max_active (MMBearerList *self)
     return self->priv->max_active_bearers;
 }
 
+guint
+mm_bearer_list_get_max_active_multiplexed (MMBearerList *self)
+{
+    return self->priv->max_active_multiplexed_bearers;
+}
+
 gboolean
 mm_bearer_list_add_bearer (MMBearerList *self,
                            MMBaseBearer *bearer,
@@ -238,11 +246,13 @@ mm_bearer_list_disconnect_all_bearers (MMBearerList *self,
 /*****************************************************************************/
 
 MMBearerList *
-mm_bearer_list_new (guint max_active_bearers)
+mm_bearer_list_new (guint max_active_bearers,
+                    guint max_active_multiplexed_bearers)
 {
     /* Create the object */
     return g_object_new  (MM_TYPE_BEARER_LIST,
                           MM_BEARER_LIST_MAX_ACTIVE_BEARERS, max_active_bearers,
+                          MM_BEARER_LIST_MAX_ACTIVE_MULTIPLEXED_BEARERS, max_active_multiplexed_bearers,
                           NULL);
 }
 
@@ -261,6 +271,9 @@ set_property (GObject *object,
     case PROP_MAX_ACTIVE_BEARERS:
         self->priv->max_active_bearers = g_value_get_uint (value);
         break;
+    case PROP_MAX_ACTIVE_MULTIPLEXED_BEARERS:
+        self->priv->max_active_multiplexed_bearers = g_value_get_uint (value);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -282,6 +295,9 @@ get_property (GObject *object,
     case PROP_MAX_ACTIVE_BEARERS:
         g_value_set_uint (value, self->priv->max_active_bearers);
         break;
+    case PROP_MAX_ACTIVE_MULTIPLEXED_BEARERS:
+        g_value_set_uint (value, self->priv->max_active_multiplexed_bearers);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -342,4 +358,13 @@ mm_bearer_list_class_init (MMBearerListClass *klass)
                            G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
     g_object_class_install_property (object_class, PROP_MAX_ACTIVE_BEARERS, properties[PROP_MAX_ACTIVE_BEARERS]);
 
+    properties[PROP_MAX_ACTIVE_MULTIPLEXED_BEARERS] =
+        g_param_spec_uint (MM_BEARER_LIST_MAX_ACTIVE_MULTIPLEXED_BEARERS,
+                           "Max active multiplexed bearers",
+                           "Maximum number of active multiplexed bearers the list can handle",
+                           1,
+                           G_MAXUINT,
+                           1,
+                           G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
+    g_object_class_install_property (object_class, PROP_MAX_ACTIVE_MULTIPLEXED_BEARERS, properties[PROP_MAX_ACTIVE_MULTIPLEXED_BEARERS]);
 }
diff --git a/src/mm-bearer-list.h b/src/mm-bearer-list.h
index 1d8db726..72fe24ff 100644
--- a/src/mm-bearer-list.h
+++ b/src/mm-bearer-list.h
@@ -30,8 +30,9 @@
 #define MM_IS_BEARER_LIST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  MM_TYPE_BEARER_LIST))
 #define MM_BEARER_LIST_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  MM_TYPE_BEARER_LIST, MMBearerListClass))
 
-#define MM_BEARER_LIST_NUM_BEARERS        "num-bearers"
-#define MM_BEARER_LIST_MAX_ACTIVE_BEARERS "max-active-bearers"
+#define MM_BEARER_LIST_NUM_BEARERS                    "num-bearers"
+#define MM_BEARER_LIST_MAX_ACTIVE_BEARERS             "max-active-bearers"
+#define MM_BEARER_LIST_MAX_ACTIVE_MULTIPLEXED_BEARERS "max-active-multiplexed-bearers"
 
 typedef struct _MMBearerList MMBearerList;
 typedef struct _MMBearerListClass MMBearerListClass;
@@ -49,10 +50,12 @@ struct _MMBearerListClass {
 GType mm_bearer_list_get_type (void);
 G_DEFINE_AUTOPTR_CLEANUP_FUNC (MMBearerList, g_object_unref)
 
-MMBearerList *mm_bearer_list_new (guint max_active_bearers);
+MMBearerList *mm_bearer_list_new (guint max_active_bearers,
+                                  guint max_active_multiplexed_bearers);
 
-GStrv mm_bearer_list_get_paths      (MMBearerList *self);
-guint mm_bearer_list_get_max_active (MMBearerList *self);
+GStrv mm_bearer_list_get_paths                  (MMBearerList *self);
+guint mm_bearer_list_get_max_active             (MMBearerList *self);
+guint mm_bearer_list_get_max_active_multiplexed (MMBearerList *self);
 
 gboolean mm_bearer_list_add_bearer (MMBearerList *self,
                                     MMBaseBearer *bearer,
diff --git a/src/mm-broadband-modem.c b/src/mm-broadband-modem.c
index 66320c63..bcd56faa 100644
--- a/src/mm-broadband-modem.c
+++ b/src/mm-broadband-modem.c
@@ -417,6 +417,23 @@ modem_create_bearer (MMIfaceModem *self,
                              task);
 }
 
+/*****************************************************************************/
+/* Create Bearer List (Modem interface) */
+
+static MMBearerList *
+modem_create_bearer_list (MMIfaceModem *self)
+{
+    guint n;
+
+    /* The maximum number of available/connected modems is guessed from
+     * the size of the data ports list. */
+    n = g_list_length (mm_base_modem_peek_data_ports (MM_BASE_MODEM (self)));
+    mm_obj_dbg (self, "allowed up to %u active bearers", n);
+
+    /* by default, no multiplexing support */
+    return mm_bearer_list_new (n, 0);
+}
+
 /*****************************************************************************/
 /* Create SIM (Modem interface) */
 
@@ -12425,6 +12442,7 @@ iface_modem_init (MMIfaceModem *iface)
     iface->load_power_state_finish = modem_load_power_state_finish;
     iface->load_supported_ip_families = modem_load_supported_ip_families;
     iface->load_supported_ip_families_finish = modem_load_supported_ip_families_finish;
+    iface->create_bearer_list = modem_create_bearer_list;
 
     /* Enabling steps */
     iface->modem_power_up = modem_power_up;
diff --git a/src/mm-iface-modem.c b/src/mm-iface-modem.c
index 5ac3da9c..20580d8f 100644
--- a/src/mm-iface-modem.c
+++ b/src/mm-iface-modem.c
@@ -5083,47 +5083,38 @@ interface_initialization_step (GTask *task)
         /* fall-through */
 
     case INITIALIZATION_STEP_BEARERS: {
-        MMBearerList *list = NULL;
+        g_autoptr(MMBearerList) list = NULL;
 
         /* Bearers setup is meant to be loaded only once during the whole
-         * lifetime of the modem. The list may have been created by the object
-         * implementing the interface; if so use it. */
+         * lifetime of the modem, so check if it exists; and if it doesn't,
+         * create it right away. */
         g_object_get (self,
                       MM_IFACE_MODEM_BEARER_LIST, &list,
                       NULL);
 
         if (!list) {
-            guint n;
-
-            /* The maximum number of available/connected modems is guessed from
-             * the size of the data ports list. */
-            n = g_list_length (mm_base_modem_peek_data_ports (MM_BASE_MODEM (self)));
-            mm_obj_dbg (self, "allowed up to %u active bearers", n);
-
-            /* Create new default list */
-            list = mm_bearer_list_new (n);
+            list = MM_IFACE_MODEM_GET_INTERFACE (self)->create_bearer_list (self);
             g_signal_connect (list,
                               "notify::" MM_BEARER_LIST_NUM_BEARERS,
                               G_CALLBACK (bearer_list_updated),
                               self);
-            g_object_set (self,
-                          MM_IFACE_MODEM_BEARER_LIST, list,
-                          NULL);
-        }
 
-        if (mm_gdbus_modem_get_max_active_bearers (ctx->skeleton) == 0)
             mm_gdbus_modem_set_max_active_bearers (
                 ctx->skeleton,
                 mm_bearer_list_get_max_active (list));
+            mm_gdbus_modem_set_max_active_multiplexed_bearers (
+                ctx->skeleton,
+                mm_bearer_list_get_max_active_multiplexed (list));
 
-        /* MaxBearers set equal to MaxActiveBearers */
-        if (mm_gdbus_modem_get_max_bearers (ctx->skeleton) == 0)
+            /* MaxBearers set equal to MaxActiveBearers */
             mm_gdbus_modem_set_max_bearers (
                 ctx->skeleton,
                 mm_gdbus_modem_get_max_active_bearers (ctx->skeleton));
 
-        g_object_unref (list);
-
+            g_object_set (self,
+                          MM_IFACE_MODEM_BEARER_LIST, list,
+                          NULL);
+        }
         ctx->step++;
     } /* fall-through */
 
diff --git a/src/mm-iface-modem.h b/src/mm-iface-modem.h
index 66d43ac0..c649a49f 100644
--- a/src/mm-iface-modem.h
+++ b/src/mm-iface-modem.h
@@ -26,6 +26,7 @@
 #include "mm-port-serial-at.h"
 #include "mm-base-bearer.h"
 #include "mm-base-sim.h"
+#include "mm-bearer-list.h"
 
 #define MM_TYPE_IFACE_MODEM            (mm_iface_modem_get_type ())
 #define MM_IFACE_MODEM(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), MM_TYPE_IFACE_MODEM, MMIfaceModem))
@@ -372,6 +373,10 @@ struct _MMIfaceModem {
     MMBaseBearer * (*create_bearer_finish) (MMIfaceModem *self,
                                             GAsyncResult *res,
                                             GError **error);
+
+    /* Create new bearer list object */
+    MMBearerList * (* create_bearer_list) (MMIfaceModem *self);
+
     /* Setup SIM hot swap */
     void (*setup_sim_hot_swap) (MMIfaceModem *self,
                                 GAsyncReadyCallback callback,