Using your home plan abroad (roaming) is the most convenient option — you do nothing and it just works — but it is usually the most expensive way to get data. A travel eSIM takes two minutes to set up and typically costs a fraction as much per gigabyte. Which one wins depends on where you are going, for how long, and how much data you use.
How each one charges you
- Roaming — daily pass: many carriers charge a flat daily fee (often around £5–£12 / $6–$14) to use your home allowance abroad. A two-week trip on a £6/day pass is ~£84 before you have used a single "extra" GB.
- Roaming — pay-as-you-go: outside bundled zones, per-MB rates can be eye-watering. This is where "bill shock" stories come from.
- Travel eSIM: you pre-pay a fixed price for a fixed data allowance and validity (e.g. a set number of GB over 7, 15 or 30 days). No daily fee, no per-MB surprises.
| Trip | Roaming daily pass | Typical travel eSIM |
|---|---|---|
| Weekend (3 days) | ~£18 (3 × £6) | Small data plan, often single digits |
| 1 week | ~£42 (7 × £6) | Mid data plan |
| 2 weeks | ~£84 (14 × £6) | Larger data plan, still usually less |
When a travel eSIM wins
- Your carrier charges a daily roaming fee or steep per-MB rates for your destination.
- You are travelling outside your plan’s included roaming zone (e.g. a UK/EU plan going to Asia or the US).
- You want a predictable, prepaid cost with no chance of a surprise bill.
- You use a fair bit of data — maps, translation, video calls home.
When roaming wins
- Your plan includes free or cheap roaming where you are going.
- You will barely use data and only for a day or two.
- You specifically need your home number’s data for a service tied to it.
Work out your allowance with the how much data do I need guide, then compare a plan for the United States, Thailand or Italy against your carrier’s roaming rate.
Frequently asked questions
Is an eSIM cheaper than roaming?
Usually yes, especially outside your carrier’s included roaming zone, where daily passes of £5–£12 or per-MB rates add up fast. The exception is when your home plan already includes free roaming at your destination.
Can I use a travel eSIM and still get calls on my normal number?
Yes. Keep your physical SIM in the phone for calls and texts, and use the eSIM for data. This avoids roaming data fees while staying reachable on your home number.
Will I get a surprise bill with a travel eSIM?
No. A travel eSIM is prepaid for a fixed data allowance and validity period. When the data or the time runs out it simply stops — there is no per-MB overage bill. You just buy more if you need it.
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