+377 is the country code for Monaco.
Every phone number in Monaco starts with +377 when you call it from another country. From the US, dial 011 377, then the number without its first 0.
- Time there
- Monaco timeCentral European Time, UTC+1 to UTC+2
- From the US or Canada
- 011 377 6 12 34 56 78
- From the UK and most of Europe
- 00 377 6 12 34 56 78
- From Australia
- 0011 377 6 12 34 56 78
- From any mobile phone
- +377 6 12 34 56 78
- Inside Monaco
- 06 12 34 56 78
- Mobile numbers
- 8 to 9 digits after +377, starting 3, 44, 45, 46, 6 or 7
- Toll-free numbers
- Start with 800 or 90
Check a +377 number to see whether it is a mobile, a landline or VoIP.
Pick the country, enter the number without the +377, and the free check shows whether it is valid and whether it is a mobile, a landline or VoIP.
In Monaco, the phone number format for apps and SMS gateways is +377 followed by the number without its 0.
| Written | Example | Where you see it |
|---|---|---|
| At home | 06 12 34 56 78 | Business cards, local ads |
| International | +377 6 12 34 56 78 | Websites, email signatures |
| E.164 | +377612345678 | APIs, SMS gateways, CRMs |
A missed call from a +377 number you don't know can be a one-ring scam, so check it before calling back.
One-ring scams call once and hang up, hoping you call back a line that bills you international or premium rates.
- Don't call back an international number you don't know. A real caller leaves a message or sends a text.
- Check the number in the box above. A number that is not a working mobile or landline in Monaco is a warning sign.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report it at reportfraud.ftc.gov, and see the FCC's guide to one-ring scams.
The codes next to +377 belong to other countries, so one wrong digit reaches a different place.
These are the questions people ask most about +377.
Which country uses the +377 country code?
Monaco. Every phone number there starts with +377 when it is dialed from abroad.
How do I call Monaco from the US?
Dial 011, then 377, then the number without its first 0. A mobile number written 06 12 34 56 78 at home is dialed 011 377 6 12 34 56 78 from the US, or +377 6 12 34 56 78 from any mobile phone.
Is +377 the same as 00377?
Yes. 00 is the exit code used in Monaco and most of the world, and the + on a mobile phone stands in for whatever exit code your network uses. From the US and Canada the exit code is 011 instead.
How many digits is a phone number in Monaco?
A mobile number has 8 to 9 digits after +377, written 06 12 34 56 78 at home.
What time is it in Monaco?
Monaco is on Central European Time, UTC+1 in winter and UTC+2 in summer.
How do I check a +377 number that called me?
Enter it in the box above. The free check shows whether it is a valid number from Monaco and whether it is a mobile, a landline or a VoIP line, which helps you spot a one-ring scam before you call back.
Sources: Google's libphonenumber numbering data for lengths, mobile starts, area code places, first-issuing networks and time zones, as of September 24, 2026; the ITU list of country codes.