Neal, I believe you purchased the Inspiron, not an XPS. In the words of Douglas Adams: Don't Panic.
EVDO: EVDO or Evolution Data Only/Evolution Data Optimized (often abbreviated as EVDO, EV-DO, EvDO, 1xEV-DO or 1xEvDO) provides fast wireless broadband (3G) internet service directly to your laptop. You take the internet
with you and surf the web in your car, on the train, in the airport, at a convention, on the road in your RV...
As you already have a cellular account, I doubt you'll have any issues. You're not buying an EVDO service as part of the laptop package.
COD4: Call to Duty 4.