Last updated: Sunday 1 November 2026
The best eSIM for the USA from the UK depends on how long you are going and how much data you use. As listed on 1 November 2026, Mozillion’s USA eSIM is the cheapest per gigabyte for most trips, at £9 for 10GB over 7 days, £11 for 10GB over 30 days or £25 for 25GB over 30 days. Breeze is the pick if you want named networks, with 10GB for £13 or 20GB for £24 over 30 days on Verizon and AT&T, hotspot included. WorldSIM suits travellers who still need calls and texts, with a £25 starter pack. All three cost far less than paying £6 to £8 a day to use your UK plan in America. This SwitchSquid guide compares prices, networks and set-up, and explains when roaming is still the better choice. If you buy through the buttons on this page, we may earn a commission; it does not change the price you pay.
Sources: Mozillion USA Travel SIM, Breeze eSIM United States, WorldSIM International eSIM Pro, Vodafone out-of-bundle prices and Uswitch roaming guide, all as listed on 1 November 2026.
Mozillion USA eSIM: 10GB for 30 days at £11
- 10GB for 30 days at £11, or 10GB for 7 days at £9, as listed on 1 November 2026
- 25GB for 30 days at £25 and 50GB at £41 for heavier use, with top-ups on the same eSIM
- Main limitation: data only, with no phone number for normal calls or texts
Best eSIM for the USA from the UK: the short answer
Cheapest for a week: Mozillion 10GB for 7 days at £9.
Cheapest for two to four weeks: Mozillion 10GB for 30 days at £11, or 25GB for 30 days at £25 if you stream or use maps all day.
Best for named networks and sharing: Breeze 20GB for 30 days at £24 on Verizon and AT&T, with personal hotspot on every plan and 10% off when you buy two or more.
Best if you need calls and texts: WorldSIM International eSIM Pro, £25 for £15 of airtime and the eSIM, with up to 10GB, 180 minutes and 45 texts depending on the country.
Stick with roaming if: you are only away for a day or two, or your UK plan already includes the USA.
USA eSIM prices compared
These are the prices each provider showed for the United States, as listed on 1 November 2026. Data-only eSIMs give you internet but not a phone number for normal calls, so WhatsApp, FaceTime and other apps handle calls instead.
Plan | Data | Valid for | Price (1 November 2026) | Cost per GB | Calls and texts |
|---|---|---|---|---|---|
Mozillion USA | 3GB | 15 days | £5 | £1.67 | Data only |
Mozillion USA | 10GB | 7 days | £9 | £0.90 | Data only |
Mozillion USA | 10GB | 30 days | £11 | £1.10 | Data only |
Mozillion USA | 25GB | 30 days | £25 | £1.00 | Data only |
Mozillion USA | 50GB | 30 days | £41 | £0.82 | Data only |
Breeze United States | 5GB | 30 days | £10 | £2.00 | Data only |
Breeze United States | 10GB | 30 days | £13 | £1.30 | Data only |
Breeze United States | 20GB | 30 days | £24 | £1.20 | Data only |
WorldSIM eSIM Pro | Up to 10GB (varies by country) | 30 days of airtime | £25 (£15 airtime plus £10 eSIM) | About £2.50 | 180 minutes and 45 texts (indicative) |
Mozillion also sells year-long USA plans with 2GB or 5GB a month, at £21 and £42, for people who travel back and forth. Breeze shows day plans as well as the fixed plans above, and its validity starts when you first use data in the USA rather than when you buy.
How much does roaming in the USA cost on a UK plan?
The USA sits outside the European roaming zones, so most UK networks charge a daily fee to use your allowance there. As listed on 1 November 2026:
Vodafone: £8 a day in Zone C, which includes the USA, for pay monthly plans started on or after 11 August 2021, unless the plan includes Global Roam.
O2: the Full Travel Bolt-On costs £7 a day for pay monthly customers, according to Uswitch.
Three: Go Roam Around the World is £8 a day for customers who joined or upgraded on or after 18 December 2025, or £7 for many older plans.
EE: Zone 1, which includes the USA, costs £6 a day or £30 for seven days, according to Uswitch.
On a 14-night trip, that is £98 on O2 and £112 on an £8-a-day plan. A 30-day Mozillion or Breeze eSIM with 10GB to 25GB costs £11 to £25 for the same trip. Roaming still has two advantages: you keep normal calls on your UK number without doing anything, and there is nothing to install. For a single day in New York on business, the daily fee can be simpler.
Mozillion USA eSIM: cheapest per gigabyte
Mozillion is a UK company that also sells SIM-only plans at home, and its Travel eSIM covers more than 200 destinations. For the USA it has the widest spread of plans in this guide, from 500MB for a day at £2 up to 50GB for 30 days at £41. The 10GB 30-day plan at £11 is the one most people should look at first: it lasts a fortnight of maps, messaging and social media for most travellers, with room for a few video calls home.
Mozillion says the eSIM activates automatically when you arrive and can be topped up while you travel. It is data only, and Mozillion’s USA page does not name the American network on its main listing, so check the network details on the page before you buy if you are heading somewhere rural. Our best travel eSIM deals guide compares Mozillion with other providers for other countries.
Breeze USA eSIM: Verizon and AT&T, hotspot on every plan
Breeze is slightly dearer than Mozillion at each data size, but it tells you exactly which networks you will use: Verizon Wireless and AT&T Mobility, on 4G LTE and 5G where available. That matters on a road trip, because your phone can use whichever of the two is stronger. Breeze includes personal hotspot on all its USA plans, so you can connect a laptop or a travel companion’s phone.
The validity clock starts on first use in the USA, so you can install the eSIM at home before you fly. Breeze takes 10% off when you buy two or more, which helps couples and families, and it offers a full refund if you have not used any data. If your trip also takes in Canada or Mexico, Breeze sells a separate North America plan. Our Breeze eSIM review covers the app and support.
Breeze USA eSIM: 20GB for 30 days at £24 on Verizon and AT&T
- 20GB for £24, 10GB for £13 or 5GB for £10, each for 30 days, as listed on 1 November 2026
- Hotspot included on every USA plan, validity starts on first use, 10% off when you buy two or more
- Main limitation: costs a little more per gigabyte than Mozillion
WorldSIM: when you still need a phone number
Most travellers are fine with data only, because WhatsApp, FaceTime and Teams work over data. If you need to ring American hotels, restaurants or hire car desks from a normal number, WorldSIM’s International eSIM Pro is different. It is a pay-as-you-go eSIM with a UK mobile number, free incoming calls in 110 countries and an optional USA number, covering more than 195 countries.
The £25 starter pack, as listed on 1 November 2026, includes £15 of airtime valid for 30 days, which WorldSIM says gives up to 10GB, 180 minutes and 45 texts depending on the country. Larger packs are £35, £50 and £100. WorldSIM labels these allowances as indicative, so use its tariff calculator for the USA before you buy. For pure data, Mozillion and Breeze are better value.
How to set up a USA eSIM before you fly
Check your phone. It needs to support eSIM and be network-unlocked. Most iPhones from the XS onwards and recent Samsung and Google phones support eSIM. Our guide to what an eSIM is explains how to check.
Buy and install at home on Wi-Fi. You will get a QR code or an in-app install. Do this a day or two before you travel so you can sort out any problems.
Keep your UK SIM on for calls, but turn off its roaming. Set the travel eSIM as your data line and switch off data roaming on your UK line, so you are not charged a daily fee by mistake.
Switch on data roaming for the travel eSIM when you land. Travel eSIMs connect as roaming lines, so this setting needs to be on for that line.
Top up rather than buy again. Both Mozillion and Breeze let you add data to the same eSIM.
If you are still deciding between an eSIM and a plastic SIM, see eSIM vs physical SIM.
How much data do you need in the USA?
Most of the data you use abroad goes on maps, messaging, social media and the odd video call. Streaming video and uploading photo backups use far more. As a guide:
Light use for a week (messages, maps, booking apps): 3GB to 5GB.
Typical use for two weeks (plus social media and some video calls): 10GB.
Heavy use or a road trip with hotspot: 20GB to 25GB.
Hotel and café Wi-Fi is common in American cities, so you can save data by turning off automatic photo backups and app updates on mobile data. Our travel eSIM guide for Christmas trips has more tips for longer trips abroad.
Fit summary
Choose Mozillion if: you want the lowest price per gigabyte, especially 10GB for 7 days at £9 or 30 days at £11.
Choose Breeze if: you want Verizon and AT&T named up front, hotspot included and a discount for buying two or more.
Choose WorldSIM if: you need a UK number with calls and texts as well as data.
Use roaming if: your trip is one or two days, or your UK plan already includes the USA at no extra cost.
Not sure which suits your trip? Ask Squid AI, SwitchSquid’s assistant, to compare the plans for your dates.
Important conditions
Prices are as listed on 1 November 2026 and can change. Check the price at checkout.
Your phone must support eSIM and be unlocked to accept another network’s eSIM.
Data-only eSIMs do not include a phone number for normal calls or texts.
WorldSIM’s data, minutes and texts are indicative and vary by country.
UK roaming prices depend on your network, plan and the date you joined. Check your own network’s current terms.
Final decision card
For most UK travellers to the USA, Mozillion’s 10GB plan at £9 for 7 days or £11 for 30 days is the best value, as listed on 1 November 2026. Pick Breeze if you want Verizon and AT&T coverage and hotspot on every plan, and WorldSIM if you need calls and texts too. Any of them costs less than £6 to £8 a day roaming.
WorldSIM International eSIM Pro: data, calls and texts from £25
- £25 starter pack: £15 of airtime plus the eSIM, valid for 30 days, as listed on 1 November 2026
- Up to 10GB, 180 minutes and 45 texts depending on the country, with a UK number and free incoming calls in 110 countries
- Main limitation: allowances are indicative, so check the USA rates in WorldSIM’s calculator first
FAQ
What is the best eSIM for the USA from the UK?
For value, Mozillion’s 10GB plan at £11 for 30 days, as listed on 1 November 2026. Breeze is the better pick if you want Verizon and AT&T named and hotspot included. WorldSIM suits people who need calls and texts.
Is an eSIM cheaper than roaming in the USA?
Usually, yes. UK networks charge £6 to £8 a day in the USA on most plans, which is £84 to £112 for 14 days. A 30-day eSIM with 10GB to 25GB costs £11 to £25.
Which networks do USA travel eSIMs use?
Breeze uses Verizon Wireless and AT&T Mobility on 4G LTE and 5G. Mozillion lists its network details under Networks & Speeds on its USA plan page. Check them before you buy if you are travelling somewhere remote.
Can I keep my UK number with a USA eSIM?
Yes, if your phone supports dual SIM. Keep your UK SIM active for texts and switch off its data roaming, then use the eSIM for data. WhatsApp and iMessage keep working on your usual number.
How much data do I need for two weeks in the USA?
About 10GB covers maps, messages, social media and some video calls for most people. Choose 20GB to 25GB if you stream, upload lots of photos or share a hotspot. Using hotel Wi-Fi stretches any plan further.
When should I install my USA eSIM?
Install it at home on Wi-Fi a day or two before you fly. Breeze’s validity starts on first use in the USA, so installing early does not waste days. Switch on data roaming for the eSIM when you land.
Does a USA eSIM work in Canada?
A USA-only plan is for the United States. Breeze sells a North America plan that covers the USA, Canada and Mexico in one eSIM. Check coverage for every country on your route before you buy.
