eSIM, physical SIM, or roaming: which should you use?

For most trips, an eSIM is the best balance of cost and convenience: you can set it up before you fly, keep your home number reachable and skip the hunt for a SIM shop. A physical local SIM usually wins on price for stays of weeks or months, while roaming with your home carrier is the simplest option but typically the most expensive per gigabyte. Here's how the three compare in practice.

eSIM

An eSIM is a digital SIM built into your phone. You buy a plan for your destination, scan a QR code, and it installs in minutes, without a shop to visit and nothing to physically swap. Most eSIM-capable phones let you keep your home number active on a second line at the same time, so you don't lose incoming calls or texts while using local data.

Best for: travellers who want to get connected before they even leave home, and who want to keep their regular number reachable at the same time.

Physical SIM (local SIM card)

A local SIM is a physical card you buy after arriving: at the airport, a convenience store or a carrier shop, and insert into your phone's SIM tray, replacing (or sharing a slot with) your existing card. It usually offers strong local rates and network coverage, since it's a genuine local carrier plan.

Best for: longer stays where you want the cheapest possible local rates and don't mind spending time finding a shop, filling out ID paperwork where required, and swapping your card in and out.

Roaming (your home carrier abroad)

Roaming means your existing home SIM connects to a local partner network automatically: no new card, no setup, nothing to install. It's the simplest option on paper, but it's typically the most expensive per gigabyte unless your home plan includes specific travel add-ons, and coverage quality depends entirely on your carrier's roaming agreements in that country.

Best for: short trips where convenience matters more than cost, or as an emergency backup if your other data option runs out.

How do the three options compare?

• Setup effort: eSIM (scan and go, before or after arrival) is the least effort; physical SIM requires a shop visit and a tray swap; roaming needs no setup at all, only a toggle.
• Cost: physical SIM is usually cheapest for longer stays; eSIM plans are typically priced close to local SIM rates; roaming is usually the most expensive per gigabyte.
• Keeping your number active: eSIM lets most phones run two lines at once; a physical SIM usually means your home number goes offline unless your phone has a second SIM slot; roaming keeps your number active by definition.
• Availability: eSIM can be bought and installed before you travel; a physical SIM requires being in the country already; roaming works the moment you land, with no purchase needed.
• What you need: eSIM requires an eSIM-compatible, carrier-unlocked phone; physical SIM requires an unlocked phone with a SIM tray; roaming requires your existing plan to support it.

Which should you choose?

If your phone supports eSIM, go with the eSIM for most trips. Save roaming for very short stays or as a backup, and consider a physical SIM when you're somewhere for weeks or months and want the lowest possible local rate.

Frequently asked questions