How can I get WWAN with Vostro 3360 ?

Hi,

I bought a Vostro 3360 last year but it didn't have the option to get WWAN.

Now I'd like to have internet with my SIM card.

What I have to buy to upgrade my Vostro and be able to get WWAN ?

If I buy a Dell 5530 or 5630, is it enough ? I guess I have to buy something to put the SIM or is it included in the Dell 5530/5630 hardware ? And how can I connect the "aux" and "main" port in the Dell 5530 ?

Thank by advance.