diff --git a/components/esp_modem/src/esp_modem_command_library.cpp b/components/esp_modem/src/esp_modem_command_library.cpp
index 77957afb2..450ede273 100644
--- a/components/esp_modem/src/esp_modem_command_library.cpp
+++ b/components/esp_modem/src/esp_modem_command_library.cpp
@@ -269,7 +269,7 @@ command_result set_data_mode(CommandableIf *t)
 command_result set_data_mode_sim8xx(CommandableIf *t)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    return generic_command(t, "ATD*99##\r", "CONNECT", "ERROR", 5000);
+    return generic_command(t, "ATD*99#\r", "CONNECT", "ERROR", 5000);
 }
 
 command_result resume_data_mode(CommandableIf *t)