+378 is the country code for San Marino.
Every phone number in San Marino starts with +378 when you call it from another country. From the US, dial 011 378, then the full number.
- Time there
- San Marino timeCentral European Time, UTC+1 to UTC+2
- From the US or Canada
- 011 378 66 66 12 12
- From the UK and most of Europe
- 00 378 66 66 12 12
- From Australia
- 0011 378 66 66 12 12
- From any mobile phone
- +378 66 66 12 12
- Inside San Marino
- 66 66 12 12
- Mobile numbers
- 8 digits after +378, starting 61 or 66
Check a +378 number to see whether it is a mobile, a landline or VoIP.
Pick the country, enter the number without the +378, and the free check shows whether it is valid and whether it is a mobile, a landline or VoIP.
Mobile numbers in San Marino start with 6, and this table shows which networks first issued each start.
| At home | From abroad | First issued by |
|---|---|---|
| 61 | +378 61 | TELENET |
| 66 | +378 66 | Telecom Italia San Marino |
TELENET started 61 and Telecom Italia San Marino started 66. People keep their number when they switch networks, so the start shows where a number began. Our free number portability lookup shows the network it is on today.
In San Marino, the phone number format for apps and SMS gateways is +378 followed by the full number.
| Written | Example | Where you see it |
|---|---|---|
| At home | 66 66 12 12 | Business cards, local ads |
| International | +378 66 66 12 12 | Websites, email signatures |
| E.164 | +37866661212 | APIs, SMS gateways, CRMs |
A missed call from a +378 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 San Marino 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 +378 belong to other countries, so one wrong digit reaches a different place.
These are the questions people ask most about +378.
Which country uses the +378 country code?
San Marino. Every phone number there starts with +378 when it is dialed from abroad.
How do I call San Marino from the US?
Dial 011, then 378, then the full number. A mobile number written 66 66 12 12 at home is dialed 011 378 66 66 12 12 from the US, or +378 66 66 12 12 from any mobile phone.
Is +378 the same as 00378?
Yes. 00 is the exit code used in San Marino 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 San Marino?
A mobile number has 8 digits after +378, written 66 66 12 12 at home.
What time is it in San Marino?
San Marino is on Central European Time, UTC+1 in winter and UTC+2 in summer.
How do I check a +378 number that called me?
Enter it in the box above. The free check shows whether it is a valid number from San Marino 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.