How to Call the UK from the US (2026 Rates)

The United Kingdom is one of the most frequently called international destinations from the US, right behind Mexico, India, and Canada. Millions of Americans have family, friends, business contacts, or clients across the Atlantic. And yet, calling a UK number from a US carrier without an international add-on often costs a dollar or more a minute — check your plan.

AT&T, Verizon and T-Mobile each price UK calls differently: some plans include texts to the UK but charge for calls, some carriers sell an international add-on for a monthly fee, and without one you pay the pay-per-use rate. Look up your own plan’s UK rate before a long call.

For a weekly call to London, those charges add up month after month. That is a lot of money for what amounts to routing digital audio across an undersea fiber optic cable.

The wholesale cost to terminate a call to a UK number is a small fraction of a carrier’s no-plan rate, and the gap is margin. VoIP services like TwinPhone charge far less than that — though, as the table below shows, VoIP services do not all charge the same, and we are not the cheapest.

There is also an important pricing detail most people overlook: UK landlines and mobiles have different rates. Landlines (numbers starting with 01 and 02) are cheaper to call than mobiles (starting with 07). This matters because many providers advertise their landline rate in big font and bury the mobile rate in fine print.

Here are five ways to call UK phone numbers, and what each one costs.

1. TwinPhone — $0.06/min to UK landlines, $0.12/min to UK mobiles. Browser-based, no app download. TLS + SRTP encryption on every call. Billed in 60-second increments, rounded up. Start from $10. Landlines and mobiles are priced separately — and these are not the lowest UK rates on this page.

2. Google Voice — $0.01/min to UK landlines and to mobiles on EE, Three, O2 and Vodafone (checked 27 September 2026). Cheaper than us by a wide margin, but it requires a US phone number to sign up, and it rounds up to the nearest minute exactly as we do.

3. WhatsApp — Free for app-to-app calls. Cannot call UK phone numbers. If your contact in London has WhatsApp and decent Wi-Fi, this works well. But you cannot call UK landlines, offices, or anyone without the app.

4. Vonage — A monthly base plan plus metered international calls. Vonage has been in the VoIP game for over 20 years and offers reliable calling, but the monthly subscription is wasteful if you only call the UK occasionally. Best for households that want a traditional home phone replacement.

5. Your US carrier — often a dollar or more a minute without an international add-on; check your plan. By far the most expensive option. The only benefit is that it requires zero setup — you just dial and it works. If you make UK calls more than once or twice a year, you are throwing money away.

The bottom line: on price per minute, Google Voice and Rebtel ($0.02/min to UK landlines and most mobiles, before VAT, checked 27 September 2026) both beat TwinPhone to the UK. TwinPhone is the option for calling real UK numbers from a browser, from any country, with no app, no US number, and the rate on screen before the call connects. WhatsApp is free but limited to app-to-app calling.

Here is a direct comparison across the five methods (competitor rates checked 27 September 2026):

Method | UK Landline | UK Mobile | Billing | Encryption | Setup TwinPhone | $0.06/min | $0.12/min | Per minute, rounded up | TLS + SRTP | 30 seconds, browser Google Voice | $0.01/min | from $0.01/min | Per-minute | Standard | US number required WhatsApp | Free (app-to-app) | Free (app-to-app) | N/A | End-to-end | App + phone number Vonage | — | — | Per-minute | Standard | Monthly plan + hardware US carrier | Plan rate | Plan rate | Per-minute | Cellular only | Existing plan

Note the landline vs mobile difference. On TwinPhone a UK mobile costs more than a landline ($0.12 vs $0.06), and carriers can charge significantly more for UK mobile numbers. Always check both rates before choosing a provider, especially if you are calling someone’s mobile.

Billing increments matter more than you might think, and they are the same everywhere on this table. If you make a lot of short calls (checking in, confirming plans, quick questions), every one of them is rounded up to a full minute — on TwinPhone too, where the increment is 60 seconds with a 60-second minimum. A 15-second call to a UK landline is billed as a full minute at $0.06. That is a reason to make fewer, longer calls; it is not a reason to pick one of these services over another.

Country code and dialing format: The UK’s country code is +44. When dialing from the US, you drop the leading 0 from the UK number. For example: • A London landline listed as 020 7946 0958 becomes +44 20 7946 0958 • A UK mobile listed as 07700 900123 becomes +44 7700 900123

With TwinPhone, just type +44 followed by the number (without the leading 0) into the dialer and hit call.

Landline vs mobile — how to tell the difference: UK landlines start with 01 or 02 (after the 0, so after +44 they start with 1 or 2). UK mobiles start with 07 (after +44, they start with 7). This is useful because landline rates are cheaper with every provider. If you have both numbers for a contact, calling the landline saves you money.

Time zones: The UK is on GMT (UTC+0) in winter and BST (UTC+1) in summer. The time difference from the US is: • US Eastern Time: UK is 5 hours ahead (4 hours during British Summer Time, late March to late October) • US Pacific Time: UK is 8 hours ahead (7 hours during BST)

The best calling window from the US East Coast is 9:00 AM - 12:00 PM EST, which reaches the UK at 2:00-5:00 PM — afternoon, people are still awake and available. From the West Coast, 7:00-10:00 AM PST reaches the UK at 3:00-6:00 PM.

Bank holidays and weekends: The UK has different public holidays than the US. If you are calling a UK business, check for bank holidays (which are different in England, Scotland, Wales, and Northern Ireland). Calling someone at home? Weekday evenings UK time (which is afternoon in the US) tend to be the sweet spot.

Mobile reception in the UK: UK mobile coverage is generally excellent in cities but can be spotty in rural areas of Scotland, Wales, and parts of Northern England. If your call drops or has poor quality, it is likely a coverage issue on the receiving end. Try calling their landline instead — it costs less and the connection is more reliable.

Getting set up to call UK numbers takes about two minutes:

1. Sign up at twin-phone.com. Register with your email or Google account. No phone number required, no credit card needed upfront. Takes roughly 30 seconds.

2. Top up your balance. Add credit with any major credit or debit card. TwinPhone is pay-as-you-go — no monthly subscription, no minimum commitment. A $10 top-up gets you about 83 minutes to UK mobiles or 166 minutes to UK landlines.

3. Dial the UK number. Open the dialer in your browser. Enter +44 followed by the UK number (drop the leading 0). The rate is displayed before you connect. Press the green call button.

Every call is encrypted with TLS + SRTP, billed per minute, and uses adaptive audio that works on slow Wi-Fi, hotel internet, airport connections, or mobile hotspots. There is nothing to install and it works in Chrome, Edge, and Brave on desktop, laptop, tablet, or phone.

If you call the UK regularly, compare that with your carrier: without an international add-on, carrier rates to the UK are often a dollar or more a minute — check your plan. On TwinPhone, $20 covers about 166 minutes to a UK mobile, with no monthly fee and a balance that does not expire.

Both have a place in your toolkit, and the smart approach is to use each where it excels.

Use WhatsApp when: The person you are calling has WhatsApp installed. Both sides have a reliable internet connection. You are making a casual call where occasional audio dropouts are not a big deal. Cost: free.

Use TwinPhone when: You are calling a UK landline (WhatsApp cannot do this). The person does not have WhatsApp. You need consistent call quality for an important conversation. You are calling a UK business or office. You want your call encrypted at the network level with TLS + SRTP. Cost: $0.06/min to landlines, $0.12/min to mobiles.

A practical strategy many TwinPhone users follow: start with WhatsApp. If the audio quality is poor or the person does not answer on WhatsApp, switch to TwinPhone and call their actual phone number. At $0.12/min to a UK mobile, an occasional fallback call is a rounding error in your monthly budget — but it is not free, and WhatsApp is.

One thing to note about WhatsApp call quality to the UK: it depends entirely on the internet connection at both ends. If your contact in London is on the Tube or in an area with weak signal, the call will suffer. TwinPhone routes through the actual UK phone network, so the last-mile delivery is handled by the local carrier infrastructure, which is more reliable than app-to-app data transfer.