Best USA eSIM Providers for UK Travellers: Airalo, Holafly, Nomad, Saily & Roampass Compared
The best USA eSIM depends on how you travel: light data, heavy data, app-based setup, GBP checkout or your existing UK roaming plan. Use this page as a quick decision guide, not a one-size-fits-all ranking.
Quick decision table
| Option | Choose it if... | Be careful if... |
|---|---|---|
| Airalo | You already trust app-based eSIM marketplaces and want a familiar brand. | You want one simple UK-focused checkout page in GBP. |
| Holafly | You use heavy data and prefer unlimited-style plans. | You need clear hotspot, fair usage and speed-limit terms. |
| Nomad | You want to compare several fixed-GB or unlimited-style packages. | You expect every USA plan to use the same network or rules. |
| Saily | You like an app-first setup with extra privacy or security features. | You do not want to manage everything inside an app. |
| Roampass | You are travelling from the UK and want prepaid USA mobile data in GBP, from £2.99. | Data-only plan. Use your UK SIM for calls, SMS and banking codes. |
| UK roaming pass | Your existing UK plan already includes generous USA roaming. | Your provider charges daily USA roaming fees, has a low fair-use cap, or makes hotspot/data rules unclear. |
View USA eSIM plans →
Check these before buying any USA eSIM
- Data amount: 1GB is backup only. 5GB to 10GB is more realistic for a normal short trip.
- Validity: match the plan length to your real travel dates, not just the cheapest price.
- Network: USA coverage varies by city, suburb, highway, airport and national park.
- Hotspot: check if tethering is allowed before using a laptop or sharing data.
- Phone number: most travel eSIMs are data-only. Keep your UK SIM active for calls, texts and banking codes.
How much data do you need in the USA?
| Trip type | Recommended data | Use case |
|---|---|---|
| Backup only | 1GB | Emergency maps, messaging, light browsing. |
| 3–5 day city break | 3GB–5GB | Maps, Uber, WhatsApp, tickets, restaurant searches. |
| One week normal trip | 5GB–10GB | Daily maps, social media, airport days, light uploads. |
| 7–14 days / road trip | 10GB–20GB | Longer stays, more navigation, more time away from Wi-Fi. |
| Heavy video or hotspot | Larger or daily data plan | TikTok, YouTube, cloud backup, laptop tethering. |
Bottom line
If you prefer an app-based marketplace, compare Airalo, Nomad or Saily. If you want unlimited-style data, check Holafly carefully. If you are a UK traveller who simply wants prepaid USA data with GBP pricing and a direct product page, Roampass is the simpler GBP-priced option.
Do not buy any plan until you have checked data amount, validity, hotspot terms and whether you need calls or SMS. For most travel use, data-only is enough because WhatsApp, maps, taxis and booking apps work over mobile data.
Travelling to the United States?
Compare prepaid USA eSIM plans from £2.99. Keep your UK SIM active and use the USA eSIM for mobile data after landing.
View USA eSIM PlansFAQ
Do USA travel eSIMs include calls and SMS?
Usually no. Most travel eSIMs are data-only. Keep your UK SIM active if you need calls, texts or banking codes.
Will WhatsApp stay on my UK number?
Yes. WhatsApp is tied to your account, not the data line you use abroad.
Can I install the eSIM before travelling?
Usually yes. Install on Wi-Fi before departure, then set mobile data to the USA eSIM after landing.
Last reviewed: June 2026. Prices, network partners, fair usage and hotspot terms can change. Always check the current provider plan before purchase.
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