eSIM & International Data

For checking the IP-geo accuracy of any of these, see Geolocation & IP. For pairing data with offline maps, see Offline Maps & Nav.

eSIM became the default international data option in 2024–26. Almost every flagship Android / iPhone since 2018 supports eSIM, and Airalo / Saily / Holafly have made buying a country-specific data plan a 5-minute affair.

eSIM marketplaces

• ★ ★ Airalo — paid; ★ ★ widest country coverage (200+); local + regional + global plans; pay-per-trip. Plans run ~$5–$70 depending on country and data; "Discover" global plans are convenient but more expensive per GB.
• Saily (NordVPN-owned) — paid; clean app; competitive pricing; smaller catalog.
• ★ Holafly — paid; ★ for unlimited data plans; pricier per day ($6–$20/day) but truly unlimited where Airalo throttles.
• Nomad — paid; competitive; clean UI.
• Ubigi — paid; older; wider regional plans.
• aloSIM — paid; alternative.
• Roamless / Yoho Mobile / Maya Mobile — paid; newer entrants; check current quality.
• Jetpac, GigSky — paid; airline-partnered options.

Direct from carrier (traditional roaming)

• T-Mobile US — included in many plans (★) — free 2G/5GB-LTE in 215+ countries; "Magenta MAX" gets faster speeds. The single best US carrier for travel.
• Google Fi — paid; uses T-Mobile + Three UK in most countries; per-GB charging or "Simply Unlimited" plan; free SMS.
• AT&T International Day Pass ($12/day) — daily-rate roaming.
• Verizon TravelPass ($10/day) — same model.
• EU EE / Vodafone / O2 — many EU plans now include free EU roaming and discounted UK roaming after Brexit-era changes.
• Japan IIJmio / Sakura Mobile / Mobal — month-pass options for Japan visitors.
• MVNOs — Visible (US, T-Mobile MVNO); Mint Mobile (US); Lyca / Three (EU) — sometimes cheaper than parents.

Local SIM (physical) — when and why

eSIM has mostly displaced this, but physical SIMs still win when:

• The country lacks eSIM-friendly local carriers (some African / Central Asian markets).
• You need a local phone number for verification (banking, food delivery).
• Your phone is older / doesn't support eSIM.

Buy at the airport convenience store on arrival; bring your passport (often required for ID verification).

Pocket Wi-Fi (mobile hotspot rentals)

• Skyroam / Solis / Tep Wireless — paid; pocket-Wi-Fi rentals; mostly displaced by eSIM but still useful for groups (one device, 5–10 connections) and tablets without SIM.
• Hotel / vacation rental routers — usually included.

Practical rules (2026)

• Test the eSIM works on home Wi-Fi before flying — install QR code, verify activation, then disable until landing.
• You can run two SIMs simultaneously — keep your home SIM for SMS / iMessage and the eSIM as the data SIM. iOS / Android both let you choose per-app data SIM.
• Most eSIM plans are data-only — no calls, no SMS — fine for WhatsApp / iMessage / FaceTime which are data-only anyway.
• Hotspotting / tethering: most eSIM plans allow it; verify per provider — Airalo and most do.
• Throttling at limit: many "unlimited" plans throttle to 256 kbps after a daily fair-use cap; check the fine print.
• Coverage maps lie occasionally — rural Vietnam, Indonesian outer islands, Andean villages may have no useful data; bring a backup.
• Buy 1–2 GB more than you think you need — Google Maps + photos backup eat surprisingly fast.

Carrier coverage cheat sheet

• T-Mobile US — globally generous; speeds are slow (2G/3G) on the basic tier; Magenta MAX gets 5G.
• Google Fi — works in 200+ countries at $10/GB or unlimited.
• EU SIM in EU — the post-2017 "Roam Like Home" rules mean an EU SIM works free across all EU countries (with fair-use limits).
• UK post-Brexit — most UK SIMs no longer roam free in EU; check.
• Japan / Korea — eSIMs (Airalo, Holafly) work fine; speeds excellent.
• China — VPN-friendly eSIMs (most international ones) are the only way to access Google / WhatsApp / Instagram without a VPN; Airalo China plan tunnels via HK and just works.

Pick this if…

• Default first eSIM, any country: Airalo.
• Unlimited data, willing to pay: Holafly.
• You're already a T-Mobile US customer: check your existing plan first; you may not need to buy anything.
• Long stay (a month+): local carrier monthly plan often cheaper than eSIM.
• Group / tablet / multiple devices: pocket Wi-Fi rental.
• China without VPN hassle: Airalo China plan (tunnels through HK).