Ring a mum in Manchester, a cousin in Cardiff, or a supplier in London from your browser, whether you are calling their mobile or their landline.
Rates updated September 15, 2026
To reach a United Kingdom number from the United States, dial these three parts in order.
011 44 7400 123456
From any mobile, anywhere in the world, you can dial +44 7400 123456 instead. Press and hold 0 to type the +, and the phone picks the right access code for wherever you are.
Numbers in United Kingdom are written locally with a 0 in front, like 07400 123456. Calling from abroad you leave that 0 out, so it becomes +44 7400 123456.
A typical United Kingdom mobile number is 10 digits after +44. If a call does not connect, count the digits first.
Only the first part changes. Your access code replaces the 011, then 44 and the number stay exactly the same.
A ~ means wait for the second dial tone before dialing the rest. It is not a digit you press.
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The single largest stream of calls into the UK is the diaspora calling home in reverse: British-based families phoning relatives who never left, and relatives abroad phoning the ones who did. The UK's foreign-born population reached 10 million (16.8%) at the 2021 census, and the biggest origin countries were India (920,000), Poland (743,000) and Pakistan (624,000), followed by Romania, Ireland, Italy, Bangladesh and Nigeria - ONS Census 2021. That map explains the inbound traffic precisely: sons and daughters in Delhi, Lahore, Warsaw, Lagos, Bucharest and Dhaka ringing parents in Leicester, Bradford, Ealing and Slough. From the United States, the callers are a mix of business (London is the counterparty for New York and Boston finance, law and media) and family, with large British-expat clusters in New York, Los Angeles, San Francisco and Florida phoning home to the Home Counties and the North.
People inside the UK dial out using the international access code 00 (so a US number is 00 1 then the 10 digits, and India is 00 91). GSM phones also accept + in place of 00, which is why so many saved UK contacts store foreign numbers in +44/+91/+1 form - Wikipedia: UK telephone numbers. The heaviest outbound corridors mirror the migration map in reverse: the UK to India, Pakistan and Bangladesh (family and outsourced business), the UK to (deep EU-era family ties), the UK to , and the steady UK to flow. A classic gotcha for anyone dialing out is remembering to drop the destination country's own trunk 0: an Indian mobile written 0-98xxx becomes 00 91 98xxx, never 00 91 098xxx.
Dial your international access code, then the UK country code 44. From a US phone that is 011 44; from a mobile anywhere you can just press + then 44. On InternationalCall.co you simply pick United Kingdom (+44) or type the number with +44.
Drop the leading trunk 0 from the UK number. A London landline written 020 7946 0321 becomes 20 7946 0321, and a mobile written 07700 912345 becomes 7700 912345.
Dial the remaining national number: 9 or 10 digits for a geographic landline (2+8, 3+7 or 4+6), or exactly 9 digits after the 0 for an 07 mobile (11 digits including the 0).
Put it together: a full London landline is +44 20 7946 0321 and a full UK mobile is +44 7700 912345.
The one rule people forget is the trunk 0: it is only for dialing within the UK and must be dropped once you add +44 - Wikipedia: UK telephone numbers. Never dial +44 0. UK numbers are commonly written as +44 (0)20 7946 0321, where the (0) is there only for domestic callers; from abroad you omit it entirely. Watch the London misformat: 020 7xxx xxxx is a 2-digit code plus an 8-digit number, not 0207 plus 7 digits, so the digits after 020 are all local. Avoid 0800/0808 (often unreachable from abroad) and service numbers when you just want to reach a person: dial their mobile or landline instead - .
The biggest live obstacle to reaching a UK landline right now is the PSTN switch-off. Openreach stopped selling new analogue lines in 2023 and the old copper network is scheduled to be turned off by 31 January 2027, with every traditional landline being migrated to Digital Voice running over broadband - Which?. For you as a caller the number does not change (a 020 or 0161 number stays the same), but the person's phone now depends on their internet and mains power, so a landline that always answered may go dead in a power cut or after a router reboot. If an elderly relative's landline suddenly stops connecting, they have very likely just been moved to Digital Voice and unplugged the new box.
Number portability is the second source of confusion. UK mobile numbers are fully portable between EE, O2, Vodafone, Three and the many virtual networks (Giffgaff, Tesco Mobile, Sky Mobile, Lebara, Lycamobile), so a 07 prefix tells you nothing about which network someone is on or even which country they are physically in - Wikipedia: UK telephone numbers. Landline numbers port too, and a Londoner can legally keep a 020 number while living in Cornwall, so an area code is a hint about history, not a guarantee of location.
have reshaped how Britons answer the phone. Ofcom's updated CLI (Calling Line Identification) guidance took effect on , requiring providers to block more international calls that display a spoofed UK number, and a further 2025 consultation targeted spoofed numbers - . The practical effect is that many UK people now let unknown numbers ring out to voicemail, especially anything that looks foreign or withholds its number. A legitimate international call with a clean caller ID is far more likely to be answered than a withheld or odd-looking one.
Strip the leading 0 and every UK number is 9 or 10 digits of national number, dialed internationally as +44 then that national number - Wikipedia: UK telephone numbers. Geographic landlines start 01 or 02 and come in a few fixed shapes: the biggest cities use a short 2-digit area code (after the 0) with an 8-digit local number, so London is 020 xxxx xxxx, and Cardiff (029), Belfast (028), Coventry (024) and Southampton/Portsmouth (023) follow the same 2+8 pattern. Most other cities use a 3-digit code with a 7-digit number (the 3+7 shape): Birmingham 0121, Manchester 0161, Edinburgh 0131, Glasgow 0141, Leeds 0113, Liverpool 0151, Sheffield 0114, Bristol 0117, Nottingham 0115, Leicester 0116 and Reading 0118 - Ofcom National Numbering Plan.
Two national renumberings still echo in how Britons write their numbers. PhONEday, on 16 April 1995, inserted a 1 after the leading 0 in almost every area code, turning 071/081 (London) into 0171/0181, 0734 (Reading) into 01734, and so on across the country, after a parallel period where both worked - PhONEday, Wikipedia. At the same time Bristol, Leeds, Leicester, Nottingham and Sheffield were given brand-new 4-digit codes and their local numbers grew from 6 to 7 digits.
The Big Number Change, completing on 22 April 2000, then created the modern 02 codes and reunified London: the split 0171/0181 became a single 020 with 8-digit local numbers, and Cardiff, Coventry, Portsmouth/Southampton and Northern Ireland moved to 029, 024, 023 and 028 - Big Number Change, Wikipedia.
The living legacy of all this is a very specific London error. 020 is the area code and the local number is the full 8 digits that follow, but because inner London used to be 0171 and outer London 0181, many people still wrongly write London numbers as or , treating the 7 or 8 as part of the code - . It is really and (and newer London numbers start and ). When you dial from abroad the split does not matter, but knowing it helps you spot a mistyped London number.
Reaching a UK mobile is the most reliable way to get a person: mobiles are personal, always carried, and on InternationalCall.co a call to a 07 number costs the same flat per-minute rate as a landline, with the person you ring paying nothing. Because numbers are portable and roaming is common, a UK mobile may ring while its owner is on holiday abroad; they still receive it normally.
Businesses, banks and government often publish non-geographic numbers that behave differently from abroad. Banks and large services love 03xx numbers (charged inside the UK at normal landline rates) and older 0345/0800 helplines; freephone 0800/0808 lines are free to the caller within the UK but frequently cannot be reached from outside the country at all, and premium 084/087/09 numbers carry a UK service charge on top of the call - gov.uk call charges. If a UK company only lists an 0800, look for its geographic +44 (0)20/(0)161 alternative for calling from overseas.
For elderly relatives, the switch to Digital Voice matters most. Their 01/02 landline number is unchanged, but the phone now runs over broadband, so it can go silent during a power cut or if the broadband box is unplugged - Which?. If an older person's landline stops connecting, try their mobile, and check whether they have recently been migrated. When you do get through, a clean international caller ID makes them far likelier to pick up rather than assume a scam.
The UK is deep in a nuisance-call era, and it has changed dialing etiquette. Ofcom's tightened CLI guidance from 29 January 2025 pushes providers to block international calls that fake a UK number, and regulators have been chasing spoofers who impersonate banks, HMRC, delivery firms and even Ofcom itself using cloned 020 and 0300 numbers - Ofcom CLI guidance. As a result, many Britons screen aggressively: unknown numbers, withheld numbers, and anything that looks slightly off are routinely ignored and left to voicemail.
There is a quirky side-effect of this that helps you. Ofcom reserves specific fictional number ranges for use in TV and film so dramas never broadcast a real person's line, including 020 7946 0xxx for London, 07700 900000 to 900999 for mobiles, and the fictional area code 01632 - Ofcom numbers for drama. If a number you were given matches one of those patterns, it is a placeholder from a show, not a working line.
The practical takeaway for calling into the UK: use a proper outbound caller ID, call at a sensible hour, and prefer the person's own mobile. A real, clean +44 call at 3pm on a Tuesday is answered; a strange-looking call at 8am is deleted unheard.
If it starts 07 and has 11 digits, it is a mobile; if it starts 01 or 02, it is a geographic landline. Mobiles are never geographic, so a 07 number tells you nothing about the person's city - Wikipedia: UK telephone numbers. On InternationalCall.co both cost the same flat per-minute rate, and the person you call pays nothing either way.
That is a common misformat. The area code is 020 and the local number is the full 8 digits after it, so it is really 020 7xxx xxxx or 020 8xxx xxxx. The habit comes from the old 0171/0181 codes that were merged into 020 during the Big Number Change in 2000 - Big Number Change. Newer London lines start 020 3 and 020 4.
No. The leading 0 is a domestic trunk prefix and you drop it after adding +44. So 020 7946 0321 is dialed +44 20 7946 0321, and a mobile 07700 912345 is +44 7700 912345 - Wikipedia: UK telephone numbers. If you see it written +44 (0)20, ignore the bracketed 0.
They have very likely been moved to Digital Voice as part of the UK's PSTN switch-off (copper landlines are being retired by 31 January 2027). The number is unchanged, but the phone now runs over broadband and can go silent in a power cut or if the box is unplugged - Which?. Try their mobile in the meantime.
Usually not. 0800/0808 freephone numbers are free inside the UK but often cannot be reached from overseas, and service numbers like 111 (NHS), 101 (police) and 999 (emergency) are UK-domestic only - gov.uk call charges. To reach a person or business from abroad, use their geographic +44 (0)20/(0)161 landline or their 07 mobile.
Scam and spoofed calls are widespread, and since Ofcom's tightened CLI rules on 29 January 2025 providers block more calls that fake a UK number, so many Britons screen unknown or withheld numbers to voicemail - Ofcom CLI guidance. A call with a clean, real caller ID at a normal hour is far more likely to be picked up.
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Start callingFinally, not every UK number is a normal call. Freephone 0800/0808 numbers, the 03xx UK-wide range (charged like a landline), premium 084x/087x/09xx service numbers, and 101 (non-emergency police) and 111 (NHS) exist alongside geographic lines, and some of these ranges cannot be reached from outside the UK at all - gov.uk call charges. When you want to reach a person, stick to their 07 mobile or their 01/02 landline.
Smaller towns use a 4-digit area code and a 6-digit number (4+6), and a handful of rural exchanges use a rare 5-digit code. This is why the block after the code looks different from place to place: it is always the same total length, just split differently. Mobiles are the easy ones: they always start 07 and are always 11 digits total (07 plus 9 more), and the specific ranges in use run across 071 to 075 and 077 to 079 - Wikipedia: UK telephone numbers.
A few 07 neighbours are traps. 070 numbers look like mobiles but are personal/follow-me numbers that can be expensive and are not a phone in someone's pocket, and 076 (outside the pager-style ranges) is not a standard mobile either. If you want a person, the safe bet is a normal 071 to 079 mobile or an 01/02 landline.