Roam Like At Home means you take your mobile plan wherever you go within EU Zone 1. The full list of countries covered includes:

Andorra, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, French  West Indies, Germany, Gibraltar, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Monaco, Netherlands, Norway, Poland, Portugal, Reunion, Romania, San Marino, Slovak Republic, Slovenia, Spain, Sweden and the U.K.