Yes. Wi-Fi in many "cave" hotels and Airbnbs in Oia (Santorini) or Mykonos Town is notoriously slow, congested, and shared with all guests. A personal eSIM gives you a private, fast 4G/5G connection that works in your room, by the pool, and, most importantly, on the beach, where hotel Wi-Fi never reaches.
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Is mobile data more reliable than the Wi-Fi at my Santorini (Oia) hotel?
Updated April 22, 2026
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