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eSIM vs roaming vs local SIM
Quick answer: An eSIM is usually the easiest way to get data abroad if your phone supports it. Roaming is the simplest but can be dearer depending on your network. A local SIM can be cheap but takes time to buy and needs an unlocked phone. Compare using your own prices.
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The three options
| Roaming on your UK plan | Travel eSIM | Local SIM | |
|---|---|---|---|
| Set-up | Nothing to do, but check settings | Install before you go (QR code or app) | Buy on arrival, swap the SIM |
| Keep your UK number active | Yes | Yes, with dual SIM | Only if you have two SIM slots or an eSIM too |
| Cost | Depends on your network and country | Fixed price per plan | Often low, but varies by country |
| Needs unlocked phone | No | Yes | Yes |
| Hassle | Lowest | Low | Highest |
How to choose
- Short trip, no fuss: check whether your network includes roaming in your destination. If it does, use it.
- Several days or a country where roaming is dear: a travel eSIM is usually simpler than a local SIM. See best eSIM providers compared.
- Long stay in one country: a local SIM or plan may be cheapest, but it takes time to arrange.
Compare with your own numbers
Prices change often, so we do not list them. Use our roaming vs eSIM cost comparer with your network's daily charge and the eSIM price, and the data calculator to estimate how much data you need. Read UK network roaming charges explained first if you are unsure what your plan includes.
Some links here are affiliate links: we may earn a small fee if you buy, at no extra cost to you.
Frequently asked questions
Is an eSIM cheaper than roaming?
It depends on your network, your destination and how much data you need. Compare your actual figures.
Can I keep WhatsApp working with my UK number abroad?
Yes, WhatsApp works over data. Your number stays tied to your account. See our guide on keeping your UK number abroad.
Do I need to turn roaming off with an eSIM?
Yes, turn off data roaming on your UK line so your phone does not use it by accident. Use the eSIM line for data.
Keep reading
- UK network roaming charges explained
- How to install an eSIM step by step
- Keep your UK number abroad
- What is an eSIM, and does my phone support it?
- How much mobile data do you need abroad?
- Best eSIM providers for travel, compared
Checked 12 November 2026. Prices, plans, airline and country rules change, so check the official or provider page before you rely on anything here.