On Three plans without roaming built in, the cheapest week of data in the United States or Turkey is the 7-day Worldwide Data Travel Pass: 18GB for £26 with Three. Travel periods of 6 to 8 days used a median of 1.38 GB in Bcengi's 2026 sample. Paying as you go, that trip's 1.38 GB costs $2.32 in the United States at $1.68/GB, metered by the KB. Bcengi is about 15 times cheaper for this trip.
This page is for Three monthly plans without roaming built in where you travel: Advanced and Lite plans, Value plans joined on or after June 22, 2025 (outside Europe only), and older Value plans once their roaming days are used. Prices are as listed on Three's website, read October 3, 2026.
What Three charges for data abroad
- The United States and Turkey: Three's 7-day Worldwide Data Travel Pass is 18GB for £26. Three's Go Roam passes there cost more: £30 for 7 days in the United States and £42 in Turkey.
- Spain, France and Italy, on plans without Europe built in: Three's 7-day Go Roam in Europe Pass is £12 ($15.90). Three charges the full price of the pass however little data the trip uses.
The trip uses 1.38 GB of the 18GB in Three's Worldwide pass, so more than nine tenths of what you paid for is left unused when the 7 days end.
What a 7-day trip costs: Three or paying as you go
Paying as you go with Bcengi, a trip costs what its data costs. Each line below is a model for a trip of 6 to 8 days: the median (1.38 GB) and the 90th percentile (6.50 GB) from the usage report, times the country's rate on October 3, 2026.
- United States rates: a median 7-day trip (1.38 GB at $1.68/GB) costs $2.32 with Bcengi; at the 90th percentile (6.50 GB at $1.68/GB), $10.92. Against Three's 7-day Worldwide Data Travel Pass (£26), the median trip is about 15 times cheaper and the 90th percentile trip about 3 times cheaper.
- Spain, France and Italy: a median 7-day trip (1.38 GB at $1.19/GB) costs $1.64 with Bcengi; at the 90th percentile (6.50 GB at $1.19/GB), $7.74. Against Three's 7-day Go Roam in Europe Pass (£12), the median trip is about 9.5 times cheaper and the 90th percentile trip about 2 times cheaper.
- Turkey rates: a median 7-day trip (1.38 GB at $1.54/GB) costs $2.13 with Bcengi; at the 90th percentile (6.50 GB at $1.54/GB), $10.01. Against Three's 7-day Worldwide Data Travel Pass (£26), the median trip is about 16 times cheaper and the 90th percentile trip about 3.5 times cheaper.
For how bundles and pay as you go compare, see bundles vs pay as you go.
What you get with Bcengi
- One reusable eSIM: install it once and use it on every trip.
- A balance that never expires: what one trip does not use is there for the next.
- No plan to pick: you never guess a size before you travel.
- Top up any time, by hand or with auto-refill.
- Your phone number stays on your home SIM for calls and texts; Bcengi is data only.
Three roaming questions
How much does Three charge for roaming in the United States?
On plans without roaming built in, Three's 7-day Worldwide Data Travel Pass is £26 and its 7-day Go Roam Around the World Pass is £30.
How do I use a travel eSIM instead of Three roaming?
Install the eSIM before you leave, set it as your data line, and turn data roaming off for your Three line so it does not use data abroad. See turn roaming off on your home line.
How these figures were measured
The usage figures come from Bcengi's 2026 International Mobile Data Usage Report: a stratified random sample of 10,000 travel periods, with usage from January 1 to September 30, 2026. The figures cover every destination in the sample, not one country.
Each trip cost on this page is a model, not a bill: the GB a trip used times the per-GB rate on our pricing page on October 3, 2026. Rates can change; the pricing page always has the current ones.
Pound prices are converted to US dollars at the Federal Reserve's rate for September 25, 2026, 1.3250 US dollars per pound.
Updated October 3, 2026. Sources: Three's roaming checker, Data Travel Pass and Data Travel Pass destinations pages; Federal Reserve exchange rates; Bcengi 2026 International Mobile Data Usage Report; Bcengi pricing page.
