Country calling codes and phone number formats

Updated 2026-09-30 · By the SMS Conecta team (SMSConecta Inc.)

Short answer: A country calling code is the 1–3 digit prefix dialled right after the + to reach a given country — +1 for the US and Canada, +44 for the UK, +91 for India, and so on. The table below gives the code, national number length and total E.164 length for every one of the 181 countries where SMS Conecta offers numbers.

Reference this table to see what a phone number from any country should look like in international (E.164) format, how many digits come after the country code, and where you can pick up a real number there.

Calling codes for all 213 countries

How to read an international phone number

International numbers are built to the ITU-T E.164 standard: a plus sign, the country calling code, and then the national significant number, with no spaces, dashes or leading trunk zero anywhere in it. The full number never exceeds 15 digits.

Whenever you're saving a contact, registering with an app or setting up a PBX, stick to the E.164 form — it's dial-able from any country and is exactly what WhatsApp, Telegram, Google and SIP systems expect to receive.

Common mistakes

• Leaving the national trunk prefix in place: +44 07700… is incorrect, +44 7700… is correct.
• Combining 00 and + in the same number: pick one, never both.
• Expecting a flat 10 digits everywhere: counts after the code range from 7 to 12, and a few countries mix lengths.
• Mixing up shared codes: the US, Canada and a number of Caribbean countries all share +1 under the North American Numbering Plan.

Frequently asked questions

What is a country calling code?

It's the 1–3 digit prefix the ITU assigns to identify a country's phone network for international dialling — for instance +1, +44 or +91.

What is E.164 format?

E.164 is the international phone number standard: a plus sign, the country code, then the national number, no spaces or leading zero, capped at 15 digits total.

Why do some countries share +1?

The US, Canada and several Caribbean nations belong to the North American Numbering Plan, so they all share +1 and are distinguished only by their 3-digit area codes.

Can I get a phone number in any of these countries?

Yes — SMS Conecta provides real mobile, local or toll-free numbers across all 181 countries in this table, usable online from anywhere for SMS, calls and SIP.

Related pages

• Phone number formatter and validator
• What is E.164?
• Phone numbers by country
• How to get a phone number in another country
• Local, mobile or toll-free?
• Pricing

Sources

• ITU-T Recommendation E.164 (as of September 2026)