NO, Gambia (smallest country in continental Africa, landlocked in Senegal along the eponymous river) is outside the EU — telecom roaming is billed at high rates with your usual carrier. The Alosea Gambia eSIM is essential for beach holidays (Atlantic beaches of Kololi, Kotu, Bijilo, long nicknamed Smiling Coast) or river birdwatching. You connect to Africell Gambia or Gamtel upon landing at Banjul (BJL).