What is data roaming?
Data roaming lets a mobile line use data on a network outside its carrier's own coverage. Abroad, your home plan may include it or charge for it. A travel eSIM can use roaming too: follow its package instructions and select the correct line for data.
Settings guidance and carrier examples checked .
What a day of roaming costs
These are specific carrier examples, with currencies and check dates. A day pass can be triggered by calls or a sent text as well as data. Eligibility, billing periods, additional lines and cruise coverage can change the total, so the daily rate alone is not a trip quote.
| Home carrier | Pass | Price | Checked |
|---|---|---|---|
| Telstra (Australia) | International Day Pass Zone 2: 2 GB a day. Zone 3 is also A$10 but has no data and requires an Upfront plan. | A$10 a day | 2026-10-23 |
| AT&T (United States) | International Day Pass Land rate for the first line; additional lines and cruise use have different rates. A 24-hour charge can start with data, a sent text, or a made or accepted call. | $12 a day | 2026-10-23 |
| Rogers (Canada) | International Travel Pass, 14 days International 14-day Travel Pass; check destination and plan eligibility. Cruise packages are separate. | C$100 for 14 days | 2026-10-23 |
Every price above links to the carrier's own page, so you can check it against your plan — passes differ by tariff and by zone. Switched roaming on and still no data? The six checks.
The two switches that matter
These controls are documented by Apple and Google. Data roaming off does not switch the home line off: calls, SMS and your usual number need a separate decision.
When roaming is still the right choice
Your existing plan may already include the destination, or you may need its voice and messaging services. Compare that plan's actual roaming terms with the data, dates and features of a travel eSIM. Neither option is always cheaper for every trip.
Rules of the country
Roaming and eSIM both meet whatever the destination requires: an identity check, a handset registry, an APN typed by hand. The rules section reads them from the primary documents, country by country.