Call Denver from the United Kingdom

Phone Number Formats to Call Denver from the UK

In the US, phone number formats are highly standardized with no variation across the country. As well, landline and mobile phone numbers are formatted exactly the same. It is not possible to tell, simply by looking at a American phone number, whether it is a mobile or landline number - and it doesn't matter for dialing purposes.

All United States phone numbers are 10-digits long and include a 3-digit area code and 7-digit local subscriber number. Increasingly, the same region may have multiple area codes. Local subscriber numbers are unique within an area code. Please check here for more information on Denver area codes.

United States phone numbers may be written to include a leading ' 1 '. This ' 1 ' can serve as either the United States country code for inbound international calls or as a national direct code for national long distance dialing in the US.

If the Denver phone number you have does not contain the full 10-digit phone number, then you'll need to double check to find the correct number.

To make an international phone call to Denver from the United Kingdom, you need to dial a 10-digit phone number formatted as follows:

Call Denver Landline Phone from the UK

00	1	aaa	nnn nnnn
international access code	country code	3-digit area code	7-digit landline number

Call Denver Mobile Phone from the UK

00	1	aaa	nnn nnnn
international access code	country code	3-digit area code	7-digit mobile number

Click here for more on Denver landline vs. mobile phone numbers.

Dialing Steps to Call Denver from the UK

To call a Denver landline or mobile phone number from the United Kingdom, follow this dialing procedure.

1. Dial UK int'l access code / IDD:  00

Note that some mobile operators may not require you to dial an IDD and/or may allow use of substitute characters (such as '+') in lieu of an IDD.

2. Dial USA country code: + 1 

If your Denver destination phone number starts with a ' 1 ' - e.g., 1 303 454 8180, then this serves as the country code. Don't dial ' 1 ' twice.

3. For both landline and mobile numbers, dial a 10-digit Denver phone number as follows:

a. Dial a 3-digit Denver area code:  aaa 

b. Dial a 7-digit local subscriber number: nnn nnnn

The main Denver area codes are 303, 720 - more Denver area codes