Win a six-night break for two to Barcelona and Seville

With Three, from April 1 you can use your mobile abroad in 18 different countries at no extra cost. With Three's regular UK tariff you can look up maps, post selfies from exotic destinations and update your Instagram feed with data roaming at no extra cost. Spain and New Zealand will be covered by the offer too from April 1.

To celebrate Three's growing list of destinations, we're giving away a six-night trip for two to Barcelona and Seville in Spain. The prize includes flights, four-star accommodation, sailing, bike riding and wine tasting, plus £500 spending money for you and a friend to enjoy on your holiday. And you'll even be able to #holidayspam your friends at home.

To enter the competition, simply answer the following question: