Travel guide
eSIM vs Roaming vs Local SIM Card: Which Is Best Abroad?
eSIM vs roaming vs local SIM card: compare cost, setup, coverage and convenience so you can pick the right option and avoid surprise charges on your trip.
When you compare an eSIM vs roaming vs a local SIM card, the short answer is this: a travel eSIM is usually the easiest way to get affordable data abroad, roaming is simplest if your plan already includes the country you are visiting, and a local SIM can be the best value for long stays. The right choice depends on where you are going, how long you are staying and whether you need a local number.
In short:
- Roaming is the least effort, but costs vary widely by network, plan and destination.
- A travel eSIM gives you data from the moment you land, set up at home, while keeping your usual number.
- A local SIM can be cheap for long stays and gives you a local number, but you have to buy it on arrival.
- Whatever you choose, check your home network’s terms before you go.
The three options at a glance
All three get you online abroad, but they work quite differently.
Roaming means your home network lets you use partner networks in another country. You keep your SIM, your number and your bill. What changes is the cost: depending on your plan and destination, roaming may be included, charged as a daily fee, or charged per megabyte.
A travel eSIM is a digital SIM you download onto your phone. Travel eSIMs like Roamy’s are data-only, so they sit alongside your usual SIM. Your normal line handles calls and texts; the eSIM handles mobile data.
A local SIM card is a physical SIM (or sometimes an eSIM) bought from a network in the country you are visiting. You get local rates and usually a local phone number, but you need to find a shop, often show ID, and swap out your home SIM if your phone has only one slot.
eSIM vs roaming vs local SIM card: side-by-side comparison
| Roaming | Travel eSIM | Local SIM card | |
|---|---|---|---|
| Cost | Varies a lot: can be included, a daily fee, or pay-as-you-go | Fixed price per plan, paid upfront | Often low for local data, especially on longer stays |
| Setup | Nothing to do, though some plans need an add-on | Install at home in a few minutes, switch on when you land | Buy in the country, sometimes with ID, then insert and set up |
| Phone number | Keeps your usual number | Data only; your usual SIM keeps your number | New local number; your usual number is off if you remove that SIM |
| Coverage | Your network’s partner networks | Partner networks in the destination; regional plans cover several countries | One country, one network |
| Convenience | High, if costs are clear | High: online on arrival, no shop visit | Lower on arrival, good once set up |
| Best for | Short trips where roaming is included | Most holidays and multi-country trips | Long stays, or when you need a local number |
Is an eSIM cheaper than roaming?
Often, but not always. It depends on what your home plan includes.
When roaming costs more
Many UK networks charge a daily fee for using your allowance in the EU, and costs outside Europe can be considerably higher or work on a pay-as-you-go basis. If you are heading to Türkiye, the United States or much of Asia, your plan may not include roaming at all, and data charges can add up quickly.
A travel eSIM avoids this by charging a fixed price for a set amount of data, or for unlimited day passes. With Roamy, Türkiye plans start from $4.00, and an unlimited day in the United States is $4.41. Prices are shown in US dollars with everything included, so you know the total before you pay.
When roaming is the better deal
Roaming can be the better option if:
- Your plan already includes roaming in your destination at no extra charge.
- You are away for a day or two and only need a small amount of data.
- You need calls and texts on your usual number as much as data, and your plan covers them.
For UK customers, it is worth knowing that the EU’s “roam like at home” rules apply to EU (and some neighbouring) networks, not automatically to UK ones. The EU’s Your Europe guide to roaming explains how the rules work. UK networks set their own roaming terms, so check yours before you travel.
Travel eSIM or local SIM: which should you choose?
This is the closer comparison, and both have real strengths.
Why a travel eSIM is usually easier
- You are online on landing. You install the eSIM at home and switch it on when you arrive, so maps and messages work straight away.
- No shop, no paperwork. There is no queue at the airport kiosk and no need to find a phone shop.
- Your usual SIM stays in your phone. You can still receive calls and texts on your normal number.
- Multi-country trips are simpler. A regional plan, such as Europe, covers a set list of countries on one eSIM.
- You can top up. Most Roamy fixed-data plans can be topped up in the app, on the same eSIM, with nothing new to install.
When a local SIM is the better choice
A local SIM is worth considering if:
- You are staying for weeks or months. Local monthly plans can work out cheaper for long stays.
- You need a local phone number, for example to receive local calls, book restaurants or use services that send codes by SMS. Data-only travel eSIMs do not include a number.
- Your phone is locked or not eSIM-compatible. A travel eSIM needs an unlocked, eSIM-compatible phone. If yours is not, a local physical SIM may be the only option (and only if the phone is unlocked).
- You want calls and texts at local rates for regular calling within the country.
The trade-off is time and effort on arrival, and possibly ID requirements, which vary by country.
How to avoid roaming charges abroad
Whichever option you choose, a few settings make a big difference. Ofcom’s guide to using your mobile abroad recommends checking your network’s charges before travelling, setting a spending limit and turning off data roaming to control costs.
If you are using a travel eSIM
- Turn data roaming off on your home line. This stops your home network charging you for data.
- Turn data roaming on for the travel eSIM. This is normal, because the eSIM uses partner networks at your destination.
- Set the travel eSIM as your mobile data line.
On iPhone, you will find these under Settings › Mobile Service. On Android, go to Settings › Network & internet › SIMs. Menu names can vary a little by phone and software version.
If you are roaming on your usual plan
- Check whether your destination is included and whether a daily fee applies.
- Look out for the welcome text your network sends when you arrive, which explains the charges.
- Use Wi-Fi for large downloads, and download maps, playlists and shows before you leave.
Before you decide: three quick checks
A few minutes of checking at home can save you money and hassle abroad.
Is your phone unlocked and eSIM-compatible?
A travel eSIM only works on an unlocked phone that supports eSIM. Most recent iPhones and many Android phones do, but some models sold in certain countries, or locked to a network, do not. On iPhone, look for an Add eSIM option under Settings › Mobile Service. On Android, check Settings › Network & internet › SIMs.
What does your home plan include?
Look up your network’s roaming page or app before you book anything. Note whether your destination is included, whether a daily fee applies, and whether there is a fair use limit.
How much data will you actually use?
Light users who mostly need maps and messages can manage with a small fixed-data plan. If you stream, work remotely or share a hotspot, an unlimited day pass may suit you better.
Which option suits your trip?
A quick way to decide:
- Weekend in Europe, roaming included on your plan: roaming is fine.
- One or two weeks anywhere, or roaming not included: a travel eSIM is usually the simplest and most predictable.
- Several countries in one trip: a regional or global travel eSIM saves juggling SIMs.
- Several months in one country, or you need a local number: a local SIM is likely to be better value.
Many travellers also combine options: a travel eSIM for data, with their home SIM kept on for calls and texts, roaming switched off for data.
Get connected with Roamy
If a travel eSIM suits your trip, Roamy has data plans for 172 countries, ready to install at home in about a minute. Your plan starts when you connect at your destination, not when you buy. Start with Europe, or see how it works before you choose.
Frequently asked questions
Is an eSIM cheaper than roaming?
Often, especially for longer trips or destinations outside your network's included roaming zone. But if your plan already includes roaming at no extra cost in the country you are visiting, roaming can be the cheaper choice.
Is a travel eSIM or a local SIM better?
A travel eSIM is usually more convenient because you install it before you leave and keep your physical SIM in place. A local SIM can be better value for long stays, or if you need a local phone number.
How do I avoid roaming charges abroad?
Check your network's roaming terms before you go, turn data roaming off on your home line if you are not using it, and use Wi-Fi or a travel eSIM for data. Ofcom also suggests setting a spending limit.
Can I keep my number with a travel eSIM?
Yes. A data-only travel eSIM sits alongside your usual SIM, so your normal number stays active for calls and texts. Your home network may charge for calls and texts abroad, depending on your plan.
