To write a mobile number with country code, use the international format: a plus sign (+), followed by the country code, then the area code and local number. The most important rule is to drop any leading trunk prefix (such as a zero) that the local number normally starts with.
How to write a mobile number with country code
The universal standard for saving or sharing a mobile number internationally is: +[country code][area code][local number]. The leading '0' is removed because the plus sign and country code replace it.
Understanding country codes
A country code is a 1- to 3-digit identifier assigned to a country or numbering group for international dialing. Common examples include +1 for the United States and Canada, and +44 for the United Kingdom. Knowing the correct country code ensures your number reaches the right country.
Why the plus sign matters
The plus sign (+) is a portable placeholder. It tells the network to use the correct international exit code for wherever the call originates. This means a number saved as +44… will work correctly whether you are calling from the US, France, or Japan, without needing to know each country's specific exit code.
Formatting the mobile number
When writing a mobile number with a country code, place the plus sign first, then the country code, then the rest of the national number. If the local number begins with a trunk prefix (like a leading zero), omit that digit in the international format.
Using the correct prefix
This is one of the key reasons to use the international format when saving contacts: it simplifies international calling codes and dialing by making the number work from any network.
Saving numbers on your phone
Save all contacts in the full international format (+ country code then number) to ensure they work when you travel or when others share your number. While exact menu steps vary by device model and operating system, the number should always be entered with the plus sign and country code in the phone number field. The most reliable saved format is +[country code][area code][local number]. Dial Assist can automatically add the correct international or local prefix when calling contacts and favorites.
Frequently Asked Questions
What is a country code in a mobile phone number?
A country code is a numerical prefix (1 to 3 digits) that identifies the country or numbering group for international calls. It is dialed before the national phone number.
Can I omit the plus sign if I know the exit code?
You can, but the plus sign is recommended because it is portable. It automatically uses the correct exit code for the network you are on, while a stored exit code like 011 will only work from the US.
Are country codes the same for all mobile numbers within a country?
Yes, every phone number (mobile or landline) within a country shares the same country code. The code does not change based on the carrier or type of line.
How do I find the country code for a specific country?
Country codes are widely available in international dialing directories and on most mobile phones when you add a new contact. The most common codes, like +1 for the US/Canada and +44 for the UK, are standard across all sources.
What happens if I keep the leading zero when saving an international number?
The call or message may fail because the leading zero is not a valid part of the international number. The trunk prefix is only used for domestic dialing and must be dropped when the country code is added.
Can I omit the country code when writing a mobile number?
It is not advisable, especially for international communication, to ensure correct dialing.
For the wider topic, see international calling codes and dialing.
