Roaming vs eSIM: What a Week Abroad Really Costs

Updated: October 2026

A pair of scales: a pile of money on one pan, a phone on the other; risograph illustration

When you go abroad you have two ways to get online: switch on roaming with your home carrier, or install an eSIM for the country you are visiting. This guide puts the two side by side, on price and on how they behave in practice.

A note on prices: Carrier roaming prices change often and differ by plan, and the figures below are deliberately rough. Before you fly, check the roaming page of your own carrier; the eSIM prices further down are live and come from our own shelf.

How carrier roaming is priced

Most home carriers sell roaming in one of four ways, and it pays to know which one yours uses:

Daily passes: A flat fee for each day you use the phone abroad, often around ten dollars a day in the US, Canada and Australia and a few pounds a day on UK networks, depending on your carrier. Two weeks away becomes a bill of well over a hundred, charged day by day.
Capped allowances: Your plan includes roaming, but with a monthly cap on data abroad, or a fair-use limit that is a fraction of what you get at home. Go over the cap and the per-megabyte rate kicks in.
Pay-as-you-go: No pass, no bundle; data is billed per megabyte at a rate that varies by country. Outside the carrier's favourite destinations the rate is often measured in pounds or dollars per megabyte, not per gigabyte.
Overage: The charge once a pass or bundle runs out. It is usually priced per hundred megabytes or per gigabyte, at many times the rate of the bundle itself.

Where the surprise bills come from

Almost every roaming horror story has one of the same few causes:

The pass is per day, not per trip: A day pass triggers on the first byte, so a phone that checks email at midnight starts a new day before you are awake.
The allowance runs out quietly: Many carriers send a text when you reach the cap; few stop the data. The rest of the trip is billed per megabyte.
Background data counts: Photo backups, app updates and video autoplay use data whether or not you are looking at the screen. On a per-megabyte rate, a single cloud backup can cost more than the whole holiday's eSIM.
Border hops: A pass bought for one country may not cover the next, and a ferry or cruise can connect you to a maritime network that no pass includes.

What the same money buys as an eSIM

A few live examples from our own shelf (we charge in euros):

Europe: 1 GB, 7 days €2.80; more than 40 countries in one plan.
Greece: 1 GB, 7 days €2.20; enough for a weekend break.
Japan: 1 GB, 7 days €2.50.
Japan: unlimited, 7 days €16.40.

The short version: per gigabyte, an eSIM costs a fraction of what roaming does on most routes. And when the plan runs out there is no overage rate; you top up if and when you want to, and you always know the price before you pay.

When roaming is the better choice

Let us be honest; there are trips where roaming wins:

Short hops: If you are changing planes and staying for a few hours, a single day pass is the simpler option.
Calls on your own number: Roaming passes usually include minutes and texts; an eSIM provides data only. If people need to reach you by phone call all day, keep roaming on for the home line, or route the calls through WhatsApp or FaceTime over the eSIM.
Roaming included in your plan: Some plans bundle a generous allowance for certain countries. If yours covers the destination with enough data, use it; the eSIM is for where it does not.

For everything else, holidays, work trips, tours and long stays, the maths points to the eSIM.

Your home SIM stays in the phone, with data roaming switched off. You remain reachable for calls and texts, including bank verification codes.
Data flows through the eSIM for the route you are travelling.
When you get home you do not need to delete the eSIM straight away. If another trip is coming soon, you can top it up; an eSIM left without a plan for a long time is closed on the network's side, and a fresh one for the next trip is all you need.

With this setup you finish the trip without ever touching the rates in the "welcome abroad" text your carrier sends on landing.

Ready?

If you know where you are going, start here: the list of destinations, the Balkan Tour and the Greek Islands route guides. New to eSIM? Read What is an eSIM? first.