Roamless
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Roamless operates a single global eSIM that works across more than 200 destinations, including full coverage in Turkey. You can choose either pay-as-you-go rates or fixed plans, depending on whether you're a frequent traveler or traveling occasionally. Setup is quick, and the same eSIM stays on your phone whether you're in Istanbul or elsewhere.
This makes sense if you travel to multiple countries and want one eSIM that goes everywhere. You won't need to swap or buy new eSIMs between legs of your trip, which saves time and simplifies your phone setup.