The +378 country code connects you to San Marino, the world's oldest republic and one of Europe's smallest states. Perched on Mount Titano in north-central Italy, San Marino covers just 61 square kilometres with a population of around 34,000. Despite being completely surrounded by Italy, San Marino maintains its own telephone system, separate from Italy's +39 code. This independence catches many callers off guard - they assume Italian numbers work for San Marino, and the call either fails or reaches an Italian line instead.
San Marino's economy depends heavily on tourism, banking, and light manufacturing. About 3 million tourists visit annually (roughly 90 times the country's population), and many of them need to make local calls during their stay. The country also has a growing community of Italian workers who commute across the border daily, creating steady cross-border calling traffic.
Quick answer: San Marino's country code is +378. San Marino phone numbers are 10 digits after the country code. There is no trunk prefix (no leading 0 to drop). Mobile numbers begin with 66 and landline numbers begin with 0549. Dial the full number exactly as shown: +378 followed by all 10 digits.
How to call San Marino: quick reference
San Marino uses no trunk prefix, so the number you see locally is the same one you dial after +378. The format below works from any country.
| Calling from | Dialing format |
|---|---|
| US/Canada mobile | +378 [local number] |
| US/Canada landline | 011-378-[local number] |
| UK | 00-378-[local number] |
| Australia | 0011-378-[local number] |
| Germany | 00-378-[local number] |
| France | 00-378-[local number] |
Understanding San Marino phone numbers
San Marino's numbering plan uses 10-digit local numbers. The country has no area codes, so the number type is identified entirely by its prefix.
Mobile numbers
San Marino mobile numbers start with 66 and follow the format +378 66XX XXXXXX. These are 10 digits total after the country code. Mobile service is provided through agreements with Italian carriers, primarily TIM (Telecom Italia Mobile).
Landline numbers
Landline numbers start with 0549, which is the area code for the entire country. The full format is +378 0549 XXXXXX, again 10 digits total. The 0549 prefix originally came from the Italian numbering plan - it was the Rimini district code assigned to San Marino before the country got its own +378 code in 1998.
Number structure
| Type | Prefix | Format | Example |
|---|---|---|---|
| Mobile | 66 | +378 66XX XXXXXX | +378 6612 345678 |
| Landline | 0549 | +378 0549 XXXXXX | +378 0549 882211 |
Mobile carriers in San Marino
San Marino doesn't have its own standalone mobile carriers. Instead, the country's telecom services are managed through partnerships with Italian operators.
San Marino Telecom (SMRT)
The state-owned San Marino Telecom handles landline infrastructure and internet services. It operates the fixed-line network across the entire country and provides broadband connections. For mobile service, San Marino Telecom has a roaming agreement with TIM (Italy), meaning San Marino mobile numbers technically run on TIM's network.
TIM (Telecom Italia Mobile)
TIM provides the underlying mobile network coverage across San Marino. San Marino mobile SIMs (66-prefix numbers) connect through TIM's infrastructure. Italian TIM customers also get coverage in San Marino without roaming charges under most plans, blurring the line between the two countries' networks.
Italian carrier coverage
Due to San Marino's small size and geography (entirely surrounded by Italy), signals from other Italian carriers like Vodafone Italia, WindTre, and Iliad also reach most of the country. Italian SIM cards generally work without issue in San Marino, though technically they're roaming - whether your carrier charges for this varies by plan.
Don't confuse +378 with nearby codes
San Marino's +378 sits in a cluster of similar-looking European codes. Here are the ones most often confused:
| Code | Country | Why it's confused |
|---|---|---|
| +39 | Italy | San Marino is inside Italy. Many people dial +39 assuming it covers San Marino too. It doesn't. |
| +376 | Andorra | Two digits off (+376 vs +378). Both are small European microstates. |
| +377 | Monaco | One digit off (+377 vs +378). Another European microstate surrounded by a larger neighbour. |
| +379 | Vatican City | Sequential code (+378 vs +379). Both are Italian enclaves with their own codes. |
The most common mistake is dialling +39 (Italy) instead of +378. San Marino had Italian numbers until 1998 when it got its own country code, and some older directories still list the old +39 0549 format. If you see a San Marino number starting with 0549, you need to add +378 in front - not +39.
Time zone considerations
San Marino follows the same time zone as Italy: Central European Time (CET, UTC+1) in winter and Central European Summer Time (CEST, UTC+2) from the last Sunday of March to the last Sunday of October.
| Your location | Time difference from San Marino | Best calling window |
|---|---|---|
| US East Coast (EST/EDT) | +6 hours | 8am-12pm your time (2pm-6pm San Marino) |
| US West Coast (PST/PDT) | +9 hours | 7am-10am your time (4pm-7pm San Marino) |
| UK (GMT/BST) | +1 hour | Anytime during business hours |
| Australia East (AEST/AEDT) | -9 to -8 hours | 5pm-9pm your time (8am-12pm San Marino) |
| Japan (JST) | -8 to -7 hours | 4pm-8pm your time (8am-12pm San Marino) |
Communication in San Marino
Business hours and customs
San Marino follows Italian business customs. Offices typically open 8:30am to 12:30pm and 2:30pm to 6:30pm, Monday through Friday. The lunch break is real - calling between 12:30pm and 2:30pm often goes unanswered. Government offices close earlier, usually by 2pm. Saturday mornings are half-day for many shops, and almost everything closes on Sunday.
Language
Italian is the official and only language of San Marino. The local dialect (Romagnol) is spoken informally by older residents, but all phone interactions will be in standard Italian. English is understood in tourist areas and banks but don't count on it for everyday calls. If you're calling a business, having some basic Italian phrases ready will help.
Network quality
Coverage across San Marino is excellent. The country's tiny size and proximity to Italian infrastructure means 4G LTE is available everywhere, including on top of Mount Titano. Call quality on both landlines and mobile is comparable to Italy. Internet speeds are solid, making VoIP calls reliable from anywhere in the country.
The San Marino diaspora
Where Sammarinese live abroad
San Marino has an unusual demographic situation: more Sammarinese citizens live outside the country than inside it. The estimated diaspora is about 15,000 people, compared to the 34,000 residents. The largest communities are in Italy (particularly in Emilia-Romagna and the Rimini area), the United States (concentrated in Detroit, Michigan and New York), Argentina, and France.
Why they call home
Family ties are tight in Sammarinese culture. Many diaspora members maintain dual citizenship and still own property in San Marino. They call home for family matters, to manage property and banking affairs, and to stay connected with the country's political life - San Marino allows overseas citizens to vote. The annual Festa di San Marino on September 3rd triggers a noticeable spike in international calls as families check in and share celebrations. Banking is another common reason for calls, as San Marino's financial sector serves many non-resident account holders who need to reach their banks by phone.
Dialing examples
Calling a San Marino mobile from the US
Your friend's San Marino mobile number is 6612 345678. From a US mobile, dial: +378 6612 345678. From a US landline, dial: 011 378 6612 345678. The +378 is the country code, and 66 confirms it's a mobile number.
Calling a San Marino landline from the UK
You need to reach a hotel in San Marino City at 0549 882211. From the UK, dial: 00 378 0549 882211. Or on a mobile, use the + format: +378 0549 882211. Note: do not drop the leading 0 from 0549 - it's part of the number, not a trunk prefix.
Calling San Marino from Italy
Even though San Marino is inside Italy, you still need the international code. Dial: 00 378 0549 882211 from an Italian landline, or +378 0549 882211 from a mobile. This trips up many people in the Rimini area who assume local dialling works.
Calling San Marino from Australia
To reach a San Marino mobile (6612 345678) from Australia, dial: 0011 378 6612 345678. From an Australian mobile, you can also use: +378 6612 345678.
Common mistakes to avoid
Using Italy's +39 code instead of +378
This is the number one mistake. San Marino used Italian numbers (under +39 0549) until 1998. Some older listings, hotel booking sites, and even Google Maps entries still show the old format. If you dial +39 0549 followed by the local number, you'll reach the Italian telephone exchange in Rimini - not San Marino. Always use +378.
Dropping the 0 from landline numbers
In many countries, you drop the leading 0 when dialling internationally. San Marino is different. The 0549 in landline numbers is the actual prefix, not a trunk code. If you dial +378 549 882211 (dropping the 0), the call won't connect. Keep all 10 digits after +378.
Assuming Italian SIM cards work as local
Visitors from Italy often assume their Italian SIM works natively in San Marino. While calls and data usually function (thanks to network agreements), you may technically be roaming. Check your plan before making a long call from San Marino - some Italian carriers charge roaming rates despite the physical proximity.
Confusing +378 with +377 or +376
Monaco is +377, Andorra is +376. One digit off in either direction sends your call to the wrong microstate. Double-check the code, especially if you're dialling from a contact list that might have the wrong entry.
Prefer calling over WiFi? See our guide to the best apps for WiFi calling.
Frequently asked questions (FAQ)
What country uses the +378 code?
San Marino. It's a microstate entirely surrounded by Italy, located on Mount Titano near the Adriatic coast. Despite its location inside Italy, San Marino has its own country code, separate from Italy's +39.
Can I dial San Marino using Italy's +39 code?
No. San Marino switched to its own +378 code in 1998. The old +39 0549 format no longer reaches San Marino numbers. You must use +378 followed by the full 10-digit local number.
Do I drop the 0 from San Marino landline numbers?
No. Unlike many countries where the leading 0 is a trunk prefix you remove for international calls, San Marino's 0549 is part of the actual number. Dial all 10 digits after +378, including the leading 0.
How much does it cost to call San Marino?
With CallSky, Economy calls to San Marino landlines cost $0.15/min and mobile calls cost $1.86/min. Premium calls cost $0.43/min for both landlines and mobile. The mobile rate is higher on Economy because San Marino mobile numbers route through Italian carrier agreements.
Will my Italian phone work in San Marino?
Usually yes. Italian SIM cards connect through TIM's network in San Marino, and most Italian carriers don't charge extra roaming fees. However, San Marino is not part of the EU, so the EU's "roam like at home" rules don't technically apply. Check your specific plan.
For more European dialing guides, see Italy (+39), Monaco (+377), or browse the full country code directory.