TL;DR. From the UK, dial 00 1 800 and the last seven digits, or +1 800 on a mobile. It is an international call, not a free one, and the line may not accept callers from the UK at all [5]. The most reliable route is the company's own number for overseas callers.
You can dial it, but it often does not connect. The US company decides where its toll-free number takes calls from. The standard options are the US, Canada and the Caribbean; the UK is not among them [6]. AT&T says that from outside the US and Canada, toll-free numbers may not connect or may be billed as international calls [5].
So a call from London has three outcomes: it connects and you pay an international rate, a recording refuses it, or it fails in silence. That depends on the company, not on how you dial.
How do you dial a 1-800 number from the UK?
Dial 00, then 1, then the ten digits: 00 1 800 555 0142. On a mobile, +1 800 555 0142 does the same job. Do not add a 0 in front of the 800, the way UK numbers start with 0. And keep the 1: it is the US country code [1]. The pattern is the same for 888, 877, 866, 855, 844 and 833 numbers [7].
Mobile: +1 800 555 0142. Never 0800 555 0142: that is a UK number.
Letters in the number? Convert them on the letters page first.
How much does it cost to call a 1-800 number from the UK?
On a UK phone, a US 1-800 number is an international call, and the free-0800 rules do not help. Ofcom's UK Calling changes did not touch international calls [3]. EE lists £4.64 a minute as its standard rate to US numbers [2]. With its monthly International Pass, that drops to £0.030[2].
What a US toll-free call costs from the UK, checked 11 Nov 2026
Other UK networks set their own US rates, so check your provider's price before a call that may sit on hold.
Is a US 1-800 number the same as a UK 0800 number?
No. Both are freephone numbers, but each is free only inside its own country. UK 0800 and 0808 numbers are free from UK mobiles and landlines [11]. A US 1-800 number is free only to callers inside the area the owner accepts, and the UK is not one of the standard options [6]. From the UK it is a call to North America, billed by your network as such.
The confusion runs both ways. Americans calling a UK 0800 number hit the same wall: it may connect from abroad, but it is not free [12]. That direction is covered on the UK 0800 page.
Which companies publish a number for callers in the UK?
Many do, and it is the best first step. Airlines often list a UK number, which makes the call a domestic one. Banks and agencies list a regular +1 number or a collect line. A collect call goes through the local operator [13]. These numbers are built for callers abroad, so they connect where the 1-800 number does not.
Official numbers that work from the UK, checked 11 Nov 2026
Which way to call a 1-800 number from the UK works best?
No route wins every call. The ranking below scores each one on getting through, cost, who can use it and setup time. A company's number for callers abroad is built to connect, so try it first when one exists. Your UK mobile scores low on cost: EE's standard rate is £4.64 a minute [2]. The scoring method is the same on every page. I did not place test calls.
#1The company's number for overseas callers
7.9/10
Best for: Banks, agencies and airlines that publish an overseas number
What should you do when the 1-800 number won't connect from the UK?
Go through the list below in order. A recording saying the number cannot be reached from your area means the line refuses foreign callers, and redialing will not change that. A silent failure often means a dialing mistake, so check the string first.
Redial as +1 800 555 0142. A missing 1 or an extra 0 is the usual mistake.
Search the company's site for 'international', 'outside the US' or 'UK'.
Use chat, or ask for a callback to a number you can answer.
Call from the US network, for example with TwinPhone, scored above.
TwinPhone costs £0.015 a minute to US toll-free numbers [4], with failed calls free [4]. It is not free, and some lines accept only callers in certain US states [8]. Its guide to dialing the US from the UK covers setup. Rules for every country are on how to call a 1-800 number from abroad; readers inside the US can start on the home page.
Emergencies in the UK
Dial 999 or 112 from a regular phone [50]. Do not rely on a calling app or a browser dialer in an emergency. TwinPhone cannot dial emergency numbers at all [8].
FAQ
Can I call a 1800 number from the UK?
You can dial 00 1 800 and the seven digits [1], but the line may not accept callers from the UK [6].
How much does it cost to call a 1800 number from the UK?
It is an international call. EE's standard rate to the US is £4.64 a minute [2]. TwinPhone charges £0.015 a minute [4].
Is the US country code 1 or 001?
The country code is 1 [1]. From the UK you add the exit code 00 [1], which is why you see 001. On a mobile, type +1.
Is a 1-800 number free from a UK mobile?
No. UK free-call rules cover UK 0800 and 0808 numbers [11], not international calls [3].
