How to Call the UK From the US
UK Calling Format From the US
To call the United Kingdom from a US phone, enter the international dialing sequence in this order:
- Dial 011, the international exit code used from the United States.
- Dial 44, the country code for the United Kingdom.
- Enter the UK area code or mobile code without its first zero.
- Enter the remaining subscriber number.
The basic pattern is 011 + 44 + UK number without the leading zero. Do not dial both 44 and the zero at the start of the domestic UK number.
This is the key rule when learning how to call the UK from the US. A UK number shown for domestic use commonly begins with zero. That zero is a national trunk prefix, not part of the number used after the UK country code.
Before calling, check that you have the full UK number, including its area or mobile code. If a person gave you only a short local number, ask for the complete number as it would be written within the UK.
How to Dial a UK Landline
For a UK landline, start with the US exit code and UK country code. Then enter the area code without its leading zero, followed by the local subscriber number.
Use this pattern: 011 + 44 + area code without zero + subscriber number.
For example, suppose a nonfunctional sample is written in domestic format as 0AAA BBB BBBB. Remove the first zero and dial it as 011 44 AAA BBB BBBB. The letters are placeholders and do not represent a working contact.
UK area codes vary in length, so do not assume every landline divides into the same number of digits. Keep the digits in their original order. Spaces and parentheses are only formatting aids and do not need to be entered.
If the number is displayed with an area code in parentheses, such as (0AAA), remove only that initial zero. Do not remove another zero later in the area code or subscriber number.
How to Dial a UK Mobile Number
A UK mobile number in domestic format normally starts with 07. To call a UK mobile from the US, remove only the first zero. The international form therefore begins with the UK country code followed by 7.
Use this pattern: 011 + 44 + 7 followed by the remaining mobile digits.
For a clearly nonfunctional example, convert 07XXX XXXXXX into 011 44 7XXX XXXXXX. Do not treat the X characters as digits or as a real contact.
A common mistake is dialing 011 44 07 and the remaining digits. That keeps the domestic trunk prefix after the country code and will usually prevent the call from connecting. Another mistake is removing both the zero and the 7. Remove the first zero only.
Calling From a Mobile Phone
On a supported mobile phone, you can usually use a plus sign in place of the US international exit code. Press and hold the zero key until the plus sign appears, then enter the UK country code and the UK number without its leading zero.
The mobile pattern is +44 + area or mobile code without zero + subscriber number. Do not enter 011 before the plus sign; they serve the same purpose.
Using the plus format can be helpful when saving a contact because it expresses the number in international form. If your phone does not accept the plus sign for a call, use 011 instead.
Examples of UK Number Formats
These examples contain letter placeholders and are deliberately nonfunctional. They show formatting only and are not contact details.
- UK landline, domestic format: 0AAA BBB BBBB
- UK landline, dialed from the US: 011 44 AAA BBB BBBB
- UK landline, mobile plus format: +44 AAA BBB BBBB
- UK mobile, domestic format: 07XXX XXXXXX
- UK mobile, dialed from the US: 011 44 7XXX XXXXXX
- UK mobile, mobile plus format: +44 7XXX XXXXXX
When dialing a UK number from the US, ignore spaces, hyphens, and parentheses. They make numbers easier to read but are not part of the dialing sequence. If a UK number is already written with +44, do not add 011, 44, or the omitted domestic zero again.
What to Check if the Call Fails
If the call does not connect, compare what you entered with the original number before trying again.
- Confirm that you used either 011 or the plus sign, but not both.
- Check that 44 appears once as the UK calling code from the US.
- Remove the leading zero from a number written in UK domestic format.
- Do not remove zeros that appear elsewhere in the number.
- Make sure no digits were dropped, repeated, or placed out of order.
- Check whether the number was already supplied in international format.
If the format is correct, your line may not have international calling enabled. Look in your carrier account settings for international-calling controls, call restrictions, parental controls, or account-level blocks. The person who manages a shared or business account may need to review those settings.
The receiving phone may also reject unidentified or international calls, be unavailable, or have a block in place. If only one UK number fails, confirm the number with its owner through a previously trusted method rather than relying on an unverified listing.
If every attempt to call the United Kingdom from the United States fails, contact your carrier through the support section of its official website or app. Ask whether international voice calling is enabled and whether the attempted call was blocked. Have the time of the attempt, the dialing format you used, and any error message ready, but do not post the full number in a public support forum.