Country guide
How to Call the UK from the US
The United States and the United Kingdom share one of the heaviest international calling corridors on the planet, work calls between New York and London, families spread across both countries, and travelers checking in with home. This guide covers the one rule that trips up almost everyone, the +44 country code, the time difference, and the cheapest reliable way to reach a UK landline or mobile straight from your browser, with no app to install.
The UK country code and the leading-zero rule
The United Kingdom's country calling code is +44. From a US phone you dial it as 011 + 44 + the UK number. From a browser-based service like Phonecall you simply enter + 44 and the number, the 011 exit code is added for you, so the same number works whether you are at home, traveling, or abroad.
Here is the single rule that causes the most failed calls: UK numbers are written nationally with a leading 0, and you must drop that 0 when dialing from outside the country. A London landline written as 020 7946 0958 is dialed internationally as +44 20 7946 0958. The 0 is a trunk prefix used only inside the UK; the +44 country code replaces it. Leave the 0 in and the call simply will not connect.
- London landline: +44 20 XXXX XXXX (national 020 becomes 20)
- Manchester: +44 161 XXX XXXX, Birmingham: +44 121 XXX XXXX, Edinburgh: +44 131 XXX XXXX
- UK mobile: +44 7XXX XXXXXX (national 07XXX becomes 7XXX)
UK area codes and mobile numbers
UK geographic area codes vary in length. The big cities use short codes, London is 20, Manchester 161, Birmingham 121, Edinburgh 131, Glasgow 141, while smaller towns use longer four, five, or six-digit codes. In every case you drop the leading 0 and keep everything after it. London is the one to remember because its code is just two digits, 20, followed by an eight-digit local number.
UK mobile numbers all begin with 7 in international form. A mobile written nationally as 07911 123456 becomes +44 7911 123456 once you remove the leading 0. Mobiles are not tied to any city, so you cannot tell location from the number, but the dialing format is identical to a landline: drop the 0, keep the rest, and put +44 in front.
Time difference between the US and the UK
The UK runs on Greenwich Mean Time (UTC+0) in winter and British Summer Time (UTC+1) from late March to late October. Relative to US Eastern Time it is normally about 5 hours ahead, when it is 9 AM in New York, it is 2 PM in London. The gap widens or narrows briefly each spring and autumn because the US and UK shift their clocks on slightly different dates.
For scheduling, the sweet spot is early US afternoon: 1 PM to 4 PM Eastern lands in the 6 PM to 9 PM range in the UK, catching people at the end of the workday and into the evening. A 9 AM Eastern call reaches the UK mid-afternoon, ideal for business. Calling after 5 PM Eastern means it is well past 10 PM in Britain, so save those for genuine emergencies.
See live per-minute rates
How to call the UK from your browser, step by step
1. Open Phonecall
Go to phonecall.app in Chrome, Safari, Firefox, or Edge on any laptop, desktop, or phone. There is nothing to download and no SIM involved.
2. Sign in and allow your microphone
Create an account with email or Google, then allow microphone access when the browser asks.
3. Enter the number as +44 with no leading 0
Type + 44, then the UK number with its leading 0 removed. For London that means + 44 20 and the eight digits; for a mobile, + 44 7 and the rest.
4. Check the rate and press call
The per-minute rate to that UK number appears before the call connects. Press call; the person answers on their normal landline or mobile.
Frequently asked questions
What is the country code for the UK?
The United Kingdom's country code is 44. From the US you dial 011 + 44 + the UK number on a regular phone, or simply + 44 and the number from a browser-based service like Phonecall.
Do I drop the 0 when calling a UK number from the US?
Yes. The leading 0 in a UK number is a national trunk prefix used only inside Britain. When you call from abroad, the +44 country code replaces it, so 020 7946 0958 becomes +44 20 7946 0958. Leaving the 0 in is the most common reason a UK call fails.
What is the time difference between the US and the UK?
The UK is normally about 5 hours ahead of US Eastern Time. Early US afternoon, roughly 1 PM to 4 PM Eastern, is the best window, landing at the UK end-of-workday and early evening.
Is calling a UK mobile different from a landline?
The dialing format is the same: drop the leading 0 and put +44 in front. UK mobiles start with 7, so 07911 123456 becomes +44 7911 123456. Rates to UK mobiles and landlines can differ slightly, and Phonecall shows the exact figure before you connect.
Calling UK landlines vs mobiles
Whether you are reaching a London office on a 020 number, a relative's mobile starting with 7, or a regional landline in Manchester or Edinburgh, the rule never changes: +44, drop the leading 0, keep everything else. Phonecall bills per second with no monthly fee and no minimum top-up, shows the exact rate before you dial, and gives every new account one free 60-second call so you can confirm a UK number works before spending anything.