Quick answer
For most short US holidays you do not strictly need a US number; data plus messaging apps covers everyday contact. A US (+1) number becomes genuinely useful if you need to call US businesses that prefer a local line, receive US SMS for deliveries, rides or verification, or register with US apps that require a local mobile. The ideal setup keeps your UK number and adds a US number on the same phone.
It is one of the most common questions for UK travellers heading stateside: is a US number worth it, or is data enough? The honest answer is “it depends on what you’ll do there.” This guide separates the situations where data alone is fine from the ones where a US number genuinely smooths the trip.
When data alone is enough
If your trip is mainly sightseeing and you stay in touch through WhatsApp, iMessage, FaceTime and email, a data-only plan covers you. Maps, ride-hailing apps, translation, bookings and social media all run on data. For a long weekend in New York where contact is mostly with people back home, a data eSIM with your UK number kept active for the odd text is perfectly adequate.
When a US number is genuinely useful
A US number earns its place when you need to interact with American businesses and services on their terms. The common triggers are below.
- Calling restaurants, tour desks, clinics or hosts who expect a local number to call back
- Receiving US SMS for deliveries, ride pickups, reservations and queue alerts
- Registering with US apps or services that require a local mobile number
- A longer stay, road trip, or business trip where US contacts need to reach you easily
- Giving an Airbnb host or car-hire desk a number they can actually dial without international charges
The best setup: keep your UK number and add a US one
You do not have to choose between your UK line and a US number. On a dual-SIM phone you keep your UK SIM active for your usual +44 number, and add a travel plan that gives you a US +1 number for local calls and texts. WorldSIM is one of the few providers built around exactly this: a single USA SIM or eSIM Pro plan can carry both a UK and a USA number, so friends at home and contacts in the States can both reach you, without roaming call rates.
Roaming vs travel plan for the USA
Transatlantic roaming on a UK contract is typically one of the priciest ways to use your phone. A prepaid travel plan bought before you fly gives a fixed cost and connects on arrival.
| Option | Cost | US number? | Keeps UK number? |
|---|---|---|---|
| UK roaming in the USA | Typically expensive | No | Yes |
| Data-only travel eSIM | Low, fixed | No | Yes (dual SIM) |
| US SIM / eSIM with number | Low, fixed | Yes (+1) | Yes (dual SIM) |
See the full cost picture with our roaming vs eSIM savings calculator. Why roaming costs more than a travel eSIM
When you roam, your home network pays a foreign operator to carry your calls and data, then passes that cost to you, usually as a flat daily fee or a steep per-megabyte rate. A travel eSIM instead sells you a local allowance directly at local-market prices, with no home-network mark-up. That structural difference is why roaming is rarely the cheapest option on a trip of any length.
eSIM compares with UK home network roaming
Choosing between international roaming and a travel eSIM isn’t just about convenience — it’s also about understanding what you’re paying for. While many UK mobile providers charge daily roaming fees and separate rates for calls, texts, or additional data, a travel eSIM offers a fixed-price solution that helps you control your travel budget.
WorldSIM eSIM Pro is designed for international travellers who need reliable connectivity across multiple destinations. In addition to flexible data bundles, selected plans include voice calls and SMS, making it a practical alternative to expensive roaming packages offered by traditional mobile networks. Here’s how it stacks up against four major UK networks’ standard PAYG roaming rates:
| Provider | Price | Voice | SMS | Data | Coverage |
| WorldSIM eSIM Pro | £25 | £0.04/min incoming, £0.34/min outgoing | £0.15 per message | 10GB–85GB bundles (£5–30/GB) | All 195+ countries |
| WorldSIM USA eSIM or SIM Card | £25 | Unlimited nationwide USA talk | Unlimited | 12GB at 5G speeds | Unlimited outgoing Calls to 75+ countries* |
| EE | £9 PAYG | £1.20/min | £0.93 | Separate roaming pass | Incoming only |
| Vodafone | £10 PAYG | £0.60/min | £0.08 | £0.12/MB (2GB–4GB bundles: £17–27) | Incoming only |
| Lyca | £10 PAYG | £0.80/min | £0.48 | 3GB–7GB bundles: £10–20 | Incoming only |
| Three | £10 PAYG | £0.35/min | £0.15 | £0.10/MB (6GB inclusive) | Incoming only |
Note: The values shown are indicative only. Please refer to the tariff calculator for voice & sms costs per destination. Airtime credit can be used in any country and can be converted into data plans here .
Lifetime Validity – 1 top-up is required within the airtime validity period to extend validity for 365 days. .
Will your UK phone work in the USA?
Almost all modern UK phones work on US 4G and 5G networks, provided the phone is carrier-unlocked. If it supports eSIM, you can install a US travel plan before you fly and switch it on when you land; check yours with our eSIM compatibility checker. WorldSIM’s US coverage runs on major networks including AT&T and T-Mobile.
Land in the USA with a +1 number and your UK line intact A WorldSIM USA plan gives you a US number, calls and data with no roaming charges, while keeping your UK number active on the same phone. See USA SIM and eSIM options
Key takeaways
- Short, sightseeing trips usually manage on data plus apps
- A US number helps for local calls, deliveries, rides and US app sign-ups
- Dual SIM lets you keep your UK number and add a +1 number
- A prepaid travel plan beats expensive transatlantic roaming
- Check your phone is unlocked and eSIM-ready before you fly
Frequently asked questions
Q: Do I need a US phone number when visiting from the UK? A: For most short holidays you do not strictly need one, since data with messaging apps covers most contact. A US number helps if you need to call US businesses that prefer a local number, receive US SMS for deliveries or verification, or register with US apps that require a local mobile.
Q: Can I keep my UK number while getting a US number? A: Yes. On a dual-SIM phone you keep your UK SIM active while adding a travel plan that provides a US number. A WorldSIM plan can include both a UK (+44) and a USA (+1) number on one line, so people can reach you on either.
Q: What is the cheapest way to use my phone in the USA? A: A prepaid travel eSIM or US SIM bought before you fly, rather than UK roaming, which is typically expensive transatlantic. A travel plan gives a fixed price and avoids surprise charges, and you can choose one that includes a US number and calls.
Q: Will my UK phone work in the USA? A: Almost all modern UK phones work on US 4G and 5G networks. Your phone must be carrier-unlocked to use a US SIM or travel eSIM. If it supports eSIM, install a US plan before you fly and switch it on when you land.
Q: Do I need a US number for Uber, deliveries or US apps? A: Many US apps work with your existing number for login, but some deliveries, ride pickups and local services send SMS updates or expect a callable local number. A US number makes these smoother, since drivers and businesses can reach you on a local line.
Q: Can a WorldSIM eSIM Pro receive OTPs from banks and government sites? Yes. WorldSIM’s eSIM Pro is SMS-enabled and receives one-time passwords from UK banks (Barclays, Monzo, HSBC), HMRC, PayPal, Apple, and Google in 195+ countries, just like a physical SIM.