Check the phone
Your exact phone needs eSIM support and the appropriate carrier unlock. The provider must accept the device.
Run the phone checkUnited Kingdom CARRIER · PUBLISHED TARIFFS
O2 international roaming: compare the trip cost
See the dated roaming options, what the selected home plan includes and how the trip price compares with a source-checked eSIM. This is a published-price comparison, not a service-quality verdict.
O2 latest Pay Monthly tariff terms (opens in a new tab) · Checked O2 using your phone abroad: Europe allowance and fair use (opens in a new tab) · Checked O2 Pay Monthly roaming Bolt On terms (opens in a new tab) · Checked
Edition reviewed · Edition 2026-10
- Reference home plan
- O2 consumer Pay Monthly personal smartphone tariff without a Plus, Volt or Ultimate inclusive non-Europe benefit.
- Standard requested data
- 7 GB over 7 days
- Home subscription
- Excluded from both comparisons
- Included roaming
- Verified eligibility required
YOUR TRIP, THE PUBLISHED COST
What could roaming cost you?
Showing the standard 7-day trip from the dated edition.
7 days · 7 GB requested · Japan
O2 Data Roaming Bolt Ons — Zone 2Each purchased bundle is valid at least 30 days; unused data rolls into the next billing month. · 7 GB across 3 sequential bundle purchasesUSD comparison: USD 62.65. Home-plan subscription excluded.GBP 47.00
miesim.es 10GB eSIM Data for 7 Days for Japan10 GB · 7 days · Price checked 2026-10-19USD comparison: USD 8.92. Provider lists tax as included.EUR 7.95
eSIM costs less byUSD 53.73
Check current price at miesim.es (opens in a new tab)Fixed edition price, checked 2026-10-19. This button opens current provider options; it does not guarantee the edition price.
Assumptions, billing and sources
7 GB requested over 7 days. Unit costs divide both trip prices by the same requested GB. Unused allowance and speed limits are described separately; this is not a speed test.
- For Europe, at least the requested data remains within the domestic allowance and 25GB monthly roaming limit.
- Opt-in Bolt On purchase prices do not count towards O2 Spend Cap. Repeated purchases require deliberate customer action.
- Only one active Data Roaming Bolt On per World Zone at a time. Service stops when its allowance is exhausted; deliberately buy the next bundle using the free link.
- Data-only bundles exclude calls and texts. No speed guarantee is inferred from the absence of a published bundle-specific cap.
- Quantity comparison: 1 GB each travel day. Network access, speed, calls and SMS are not equivalent.
- Quoted retail charges use the stated tax basis; account-specific taxes and checkout fees may change the amount paid.
eSIM package conditions
- Choose the exact allowance and validity on the destination page; this link does not preselect the UUID package.
- The provider feed says activation starts on first use.
- Data-only package. Traditional calls and SMS are not included. Optional app calling or separately purchased numbers are not included in this price.
O2 latest Pay Monthly tariff terms (opens in a new tab) · Checked O2 using your phone abroad: Europe allowance and fair use (opens in a new tab) · Checked O2 Pay Monthly roaming Bolt On terms (opens in a new tab) · Checked O2 Data Roaming Bolt Ons: prices and country zones (opens in a new tab) · Checked O2 Bolt Ons help: Pay Monthly Data Roaming (opens in a new tab) · Checked eSIM package source (opens in a new tab)eSIM tax evidence (opens in a new tab)
About these prices
1 GB requested per day. A single billing cycle is assumed. Home-plan subscription is excluded. Choose an included-roaming profile only if its eligibility applies to you.
Lowest-cost modeled eligible product or defined pack only. We do not combine arbitrary roaming add-ons. The eSIM comparison uses a limited, dated retail selection.
This edition uses 73 frozen reference packages selected from 362 qualifying fixed-data offers from 2 providers (Torisim, miesim.es), a limited catalog selection. Benchmark packages have explicit tax-included evidence. Incremental published retail charges. UK/Ireland tax-inclusive prices, Australian published consumer roaming charges and US/Canadian prices before account-specific taxes are retained as stated; tax treatment is disclosed by carrier. eSIM references have explicit tax-inclusive evidence. Ratios are comparisons of these quoted charges, not tax-normalized checkout bills.
THE STANDARD DESTINATIONS
O2 roaming cost by country
7 days at 1 GB per day. A missing or insufficient option is shown as not comparable, rather than a guessed price.
10 destinations
BEFORE YOU TRAVEL
Check the setup and the billing triggers
Read the exact package
Check allowance, validity, activation, hotspot and the final current checkout price.
Compare current packagesReview the home line
Calls, texts and other use can trigger roaming charges under the carrier terms. Disabling data roaming alone does not settle every billing condition.
Read carrier sourcesSet the right data line
Follow the travel eSIM's activation and roaming instructions. Check your home line and automatic data switching separately.
Review phone compatibilityExisting consumer postpaid subscription is already held; its domestic monthly charge is excluded. All charged travel days fall within one billing cycle, with no earlier roaming use. Personal terrestrial smartphone data only; calls, texts, aircraft, maritime and satellite use are excluded. For Europe, at least the requested data remains within the domestic allowance and 25GB monthly roaming limit. Opt-in Bolt On purchase prices do not count towards O2 Spend Cap. Repeated purchases require deliberate customer action.
Included-plan eligibility: Selected Plus/Volt plans include 27 non-Europe destinations, including Mexico; Ultimate includes 75. O2 Travel inclusive benefits remain capped at 2Mbps.
CHECK THE CURRENT PACKAGE
Compare an eSIM for your trip
These are dated retail benchmarks, not physical test recommendations. Confirm phone compatibility, hotspot, activation and the final price before buying.
Open the current plan finderDirect provider links are not affiliate links.
7 days · 7 GB requested
miesim.es 10GB eSIM Data for 7 Days for Japan
10 GB · 7 days · Checked 2026-10-19
O2 roaming questions
What does the O2 comparison include?
This page uses the O2 consumer Pay Monthly personal smartphone tariff without a Plus, Volt or Ultimate inclusive non-Europe benefit. reference profile, the dated carrier sources and the standard trip shown in the table. It excludes the home-plan subscription. Included-roaming profiles apply only when their verified eligibility matches your plan.
How is the roaming cost multiple calculated?
For the same trip and requested data amount, we divide the carrier roaming cost per requested GB by the eSIM package cost per requested GB. Because both sides use the same denominator, the multiple is also the roaming trip price divided by the eSIM package price. A package may include unused data. We describe caps and conditions separately and do not claim equal performance.
Is roaming ever cheaper than an eSIM?
Yes. An eligible home plan may include roaming, or a carrier add-on may cost less for the selected trip. Those results remain visible. The comparison excludes the home-plan subscription and does not assume every customer qualifies for an included benefit.
Why is a carrier not ranked?
A rank requires current, comparable costs for the complete standard destination basket. Missing eligibility, unavailable source facts, an insufficient data allowance or expired checks leave a carrier unranked. An unknown price is never treated as zero.
Have you physically tested these eSIMs?
This edition compares published carrier tariffs and source-checked retail eSIM packages. It does not use physical activation tests, measured speeds or a reliability score. Prices, coverage, eligibility and checkout terms can change.
CHECK THE ORIGINAL INFORMATION
O2 sources and conditions
O2 latest Pay Monthly tariff terms (opens in a new tab) · Checked O2 using your phone abroad: Europe allowance and fair use (opens in a new tab) · Checked O2 Pay Monthly roaming Bolt On terms (opens in a new tab) · Checked
Published tariffs and eligibility can change. Original source links and their independent check dates are shown above. Saved captures are linked only where available; provider buttons open current options. Use the complete method and edition history alongside these figures.
KEEP PLANNING
Compare other carriers
Compare current prices for your trip.
Compare eSIMs