NO, São Tomé and Príncipe (Lusophone volcanic archipelago in the Gulf of Guinea, 250 km from African coast, one of Africa's smallest countries) is outside the EU — telecom roaming is billed at high rates. The Alosea São Tomé eSIM is essential for Portuguese diaspora or exotic trips (Pico Cão Grande — emblematic 663 m volcanic tower, paradisiac deserted beaches, virgin forest — confidential ecotourism destination rising). You connect to CST or Unitel STP upon landing at São Tomé (TMS).