diff --git a/drivers/modem/modem_socket.c b/drivers/modem/modem_socket.c
index 92522c72e54..c388c24ad53 100644
--- a/drivers/modem/modem_socket.c
+++ b/drivers/modem/modem_socket.c
@@ -19,6 +19,24 @@
  * Packet Size Support Functions
  */
 
+u16_t modem_socket_next_packet_size(struct modem_socket_config *cfg,
+				    struct modem_socket *sock)
+{
+	u16_t total = 0U;
+
+	k_sem_take(&cfg->sem_lock, K_FOREVER);
+
+	if (!sock || !sock->packet_count) {
+		goto exit;
+	}
+
+	total = sock->packet_sizes[0];
+
+exit:
+	k_sem_give(&cfg->sem_lock);
+	return total;
+}
+
 static u16_t modem_socket_packet_get_total(struct modem_socket *sock)
 {
 	int i;
diff --git a/drivers/modem/modem_socket.h b/drivers/modem/modem_socket.h
index 4b3e5e7a7d2..edda1f1085c 100644
--- a/drivers/modem/modem_socket.h
+++ b/drivers/modem/modem_socket.h
@@ -59,7 +59,9 @@ struct modem_socket_config {
 	const struct socket_op_vtable *vtable;
 };
 
-/* return total size of remaining packets */
+/* return size of the first packet */
+u16_t modem_socket_next_packet_size(struct modem_socket_config *cfg,
+				    struct modem_socket *sock);
 int modem_socket_packet_size_update(struct modem_socket_config *cfg,
 				    struct modem_socket *sock, int new_total);
 int modem_socket_get(struct modem_socket_config *cfg, int family, int type,