Is +1 the same as 011 when calling from the UK?

Almost, but not quite. The + symbol is a universal placeholder that your phone replaces with the local international exit code, which is 00 in the UK and most of Europe. The 011 is the US exit code, used when dialing OUT of the US to anywhere else. From a UK number you never dial 011; you dial 00 or use +. The mistake people make is copying a US-formatted dialing string like 011 44 20 7946 0000 and trying to use the 011 from London. Save US contacts in your phone as +1 followed by area code and number, and the OS handles the rest regardless of which country you are in.

Does O2's International Bolt On cover toll-free US numbers?

No. O2's £3-a-month International Bolt On covers calls to regular US landlines and mobiles at 1p per minute, but US toll-free 800, 833, 844, 855, 866, 877, and 888 numbers are explicitly excluded from every UK carrier's international add-on. Dialing those numbers with the bolt-on active still bills at the standard out-of-bundle rate of around £3 per minute. Vodafone Global Roaming Plus and EE Travel Pass have the same carve-out. The fix is to dial the company's +1 direct line instead, which IS covered by the bolt-on. Banks publish these on the back of their cards under "calling from outside the US."

Can I keep a UK SIM and get free US calls through eSIM?

Yes, by adding a US-based eSIM on a dual-SIM iPhone or Android. A Tello, Mint Mobile, US Mobile, or Google Fi eSIM purchased while physically in the US (or through their UK-accepting checkout) gives you a US phone number that places calls to other US numbers as domestic. Plans start around $8 monthly. The catch is activation: most US carriers require a US billing address and US-issued payment method, and US Mobile is one of the few that ships activation kits to UK addresses. For occasional calls only, a browser dialer at $0.04 per minute is cheaper than any monthly US SIM plan. For regular US calling plus a US-presenting number, the eSIM wins.

Will US recipients see my UK mobile number on caller ID?

Yes, by default. A call from a Vodafone or EE SIM to a US number shows your full +44 number on the recipient's caller ID. Many US iPhones and Android phones now label unknown international numbers as "Spam Likely" or "Scam Likely," especially in the +44 range, because spam call volume from spoofed UK numbers has been high since 2023. To improve answer rates, either text the recipient in advance so they know to expect the call, or use a browser dialer that displays a US-pool caller ID. The downside of the US caller ID is that the recipient cannot call you back at that number; give them your real +44 line during the conversation.

Call US from UK: Cheapest Methods in 2026

Calling the US from the UK on your mobile costs £1.50-3.00 per minute. That's £30-60 for a 20-minute call to your bank. Vodafone charges £3/minute standard. O2 and EE aren't much better. If you've ever checked your bill after calling a US number, you know the feeling.

You have better options. Here's what they actually cost.

Your Options at a Glance

Four ways to call the US from the UK, ranked by cost.

Method	Cost	Setup Required
UK mobile carrier (standard)	£1.50-3.00/min	None
Carrier international add-on	£3-10/month + lower rates	Plan change
VoIP subscription	£5-15/month	App download
World Dialer	$0.04/min (~3p)	None

The maths isn't complicated. A 20-minute call to Chase costs £60 on Vodafone's standard rate. The same call through World Dialer costs $0.80 (about 64p).

Why UK Carriers Charge So Much

UK carriers treat international calls as a profit centre, not a service. They know most people don't check rates before dialling. They know you'll pay whatever shows up on the bill.

Yes, carriers offer international bolt-ons. O2's is £3/month for 1p/minute calls. Three offers 3000 minutes to the US for £5/month. But you have to set these up before you need them. Most people discover their carrier's rates mid-call, then discover the add-ons existed afterwards.

The Toll-Free Trap

US toll-free numbers (1-800, 1-888, 1-877) aren't free from the UK. You can dial them - punch in 00 1 800 and the rest - but you'll pay full international rates. Sometimes more.

Here's what happens when you dial a US 1-800 number from the UK:

Best case: It connects, and you pay £50-00/minute
Worse case: The company blocks international calls to that number
Either way: Not free

Always find the company's regular +1 number instead. That's what the tables below are for.

How to Dial the US from the UK

Dial +1 followed by the 10-digit US number. Most mobiles accept this format directly.

Format: +1 (XXX) XXX-XXXX

From a UK landline, dial 00 1 then the number: Format: 00 1 XXX XXX XXXX

That's it. No access codes, no operator assistance. Just +1 and the number.

Numbers You'll Actually Need

Here are the international numbers for US banks and government agencies. These aren't toll-free numbers - they're direct lines that work from anywhere.

Institution	Number	Hours (UK Time)
Chase Bank	+1 (713) 262-3300	24/7
Bank of America	+1 (315) 724-4022	12 PM - 3 AM
Bank of America (Credit Cards)	+1 (302) 738-5719	12 PM - 3 AM
IRS International	+1 (267) 941-1000	11 AM - 4 AM
Social Security	+1 (410) 965-7306	1 PM - 8 PM

Note: Bank of America accepts collect calls at the number above. Chase's line is specifically for fraud and account issues.

Save these numbers. You'll need them eventually, and searching for "Chase international number" while on hold isn't ideal.

Best Times to Call

US East Coast business hours (9 AM - 5 PM) are 2 PM - 10 PM in the UK. West Coast hours (9 AM - 5 PM PT) run 5 PM - 1 AM UK time.

Call US East Coast businesses in your early afternoon. That catches them at the start of their day, before the queues build up. Calling the IRS at 2 PM UK time (9 AM Eastern) means shorter hold times than calling at 9 PM UK time (4 PM Eastern).

The UK and US switch to daylight saving time on different dates. In late March and early November, the time difference shifts by an hour for a few weeks. Check before calling if you're near those dates.

What It Actually Costs

Your carrier wants you to think international calls are inherently expensive. They're not. The phone companies that built the infrastructure have been paid. The marginal cost of connecting your call to a US number is fractions of a penny.

World Dialer charges $0.04/minute because that's what it actually costs to route a call, plus enough margin to keep the lights on. No subscription because you don't need one. No app because your browser already works.

Open worlddialer.com. Enter the number. Add a few dollars of credit. Click call. That 20-minute call to Chase? $0.80 instead of £60.

We'll be here next time you need us.