Hi Jaime, if you live on base I would reccomend you to use a Vodafone KEY (or similar from other providers)... it will be less painful. ;-)
V/r
Carlo
P.S.: In case you may need computer or IPhone assistance please visit these links:
http://www.naplesallhands.com/item.aspx?id=4873
http://www.naplesallhands.com/item.aspx?id=6110
www.naples-pcclinic.com