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Is 20GB Enough for a Month of Travel?

For most travelers, 20GB comfortably covers a month abroad: just over 650MB a day for maps, messaging, social feeds and music. Here is what each activity really uses, three monthly traveler profiles, and the settings that stop background apps from draining the bundle.

co:sim TeamMar 5, 20267 min

eSIM Guides

What Is Data Roaming? (And When to Turn It Off)

Data roaming is your phone using a mobile network your home carrier doesn't own, billed at roaming rates. Here's how it works, when to switch it off, and why a travel eSIM actually needs it turned on.

co:sim TeamMar 2, 2026

7 min

eSIM Guides

Best eSIM for South Korea (2026): Networks, Plans & Coverage

Korea's three networks are all excellent, so the real eSIM decision is plan shape and data size. Coverage facts, the Naver Map factor, Incheon airport counters, and how much data a streaming-heavy Korea trip really needs.

co:sim TeamFeb 28, 20268 min

eSIM Guides

Does an eSIM Come With a Phone Number?

Travel eSIMs are almost always data-only, so they don't come with a phone number — and they never change yours. Here's how your real number keeps working abroad via dual SIM, and the rare cases where you actually need a local one.

co:sim TeamFeb 26, 20267 min

eSIM Guides

Best eSIM for Thailand (2026): Plans, Networks & What to Buy

Which eSIM should you buy for Thailand? Networks, data sizing, island coverage, and setup before you board — a practical buying guide.

co:sim TeamFeb 19, 20266 min

eSIM Guides

Best eSIM for Japan (2026): How to Choose the Right Data Plan

Which eSIM should you buy for Japan? How to match networks to your itinerary, size your data budget, and set everything up before you board.

co:sim TeamFeb 12, 202610 min

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