Integrate modem in DELL Latitude E5520

Hello everybody. I buy a new DELL Latitude E5520. After deleting the window i see that it has a modem integrated wich can allowed to connect to internet. Unfortanately i try lot of things to make it working with my ubuntu 16.04 LTS but i failed.
And i want to know if anyone succeed with this. Thanks for responding.

I’ve moved this to the https://community.ubuntu.com/c/support-help-requests category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the Finding Help page.