1. Check existing EU roaming before buying an eSIM
Travelers with an eligible mobile plan from an EU country can generally use calls, texts, and data in another EU country at domestic rates under “Roam Like at Home,” subject to fair-use conditions and the plan’s terms. Confirm Greece is included and check any high-data or long-stay limits with the carrier.
2. A travel eSIM is most useful for these travelers
- Visitors arriving from outside the EU.
- Travelers whose home carrier charges high roaming fees.
- People moving through multiple countries before or after Greece.
- Travelers who need a secondary data line while keeping the home number active.
- Travelers who want data active before leaving the airport.
3. Estimate data by behavior
| Use pattern | Planning approach | Main caution |
|---|---|---|
| Maps, messaging, tickets | Low-to-moderate data plan | Download offline maps and documents |
| Social uploads and video calls | Higher allowance | Upload on hotel Wi-Fi when practical |
| Hotspot for laptop or companion | Confirm tethering and larger allowance | Some plans restrict hotspot use |
| Multi-country Europe route | Regional plan may be simpler | Check every included country |
4. Compare the current project-approved options
Airalo
Compare Greece or regional plans and confirm activation steps.
Check Airalo →Yesim
Review Greece coverage, allowance, validity, and device compatibility.
Check Yesim →Saily
Compare the project-approved Saily option and current plan details.
Check Saily →GigSky
The current project link is oriented to the iOS app; verify device fit.
Check GigSky →5. Install before the travel day
- Confirm that the phone supports eSIM and is carrier-unlocked.
- Install on reliable Wi-Fi while the provider instructions are available.
- Do not activate early when validity begins at activation.
- Save the QR code, order number, and support instructions offline.
- Choose which SIM handles data and disable unexpected roaming on the home line.
6. Prepare for weak signal and ferry-day gaps
Mobile coverage can vary by island, building, coastline, vessel, and network load. Download ferry tickets, hotel addresses, maps, and transfer details before leaving stable Wi-Fi. Connectivity is a planning aid—not a substitute for offline access to essential documents.
7. Purchase checklist
- Greece and every onward country are included.
- Plan validity matches the full route.
- Hotspot use is allowed when needed.
- Activation timing is understood.
- The phone is compatible and unlocked.
Official sources and live verification
Use these sources to confirm current transportation, passenger rights, roaming, and destination information before booking.