San Marino phone number format
How do you format a San Marino phone number?
Write a San Marino phone number with the country code +378. A mobile looks like 66 66 12 12 inside San Marino and +378 66 66 12 12 from abroad. Mobiles have 8 digits after the country code, and the E.164 form is +37866661212. Format alone never shows a line is in service.
Free, runs in your browser; nothing is sent. The sample is a sample, not a real line.
Paste your San Marino numbers (a mixed list is fine). They are counted here at once; the free checker then gives every number its E.164 form, country and line type, with a file to download.
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See the phone add-onSan Marino number format at a glance
| Country calling code | +378 |
|---|---|
| International prefix (calling out of San Marino) | 00 |
| Trunk prefix (domestic dialling) | None |
| Mobile number length | 8 digits after +378 |
| Landline number length | 10 digits after +378 |
| Mobile vs landline from the digits | Yes, separate ranges |
In short: +378, 8 digits for a mobile. The checker below formats any San Marino number free in your browser; it can't say whether a line is live. Bulk phone number validator · Pro + Phone plan
Example San Marino phone numbers
These are the example numbers from Google’s libphonenumber data, the same numbering-plan data our validator uses, written three ways.
| Format | Mobile | Landline |
|---|---|---|
| National (inside San Marino) | 66 66 12 12 | 0549 886377 |
| International | +378 66 66 12 12 | +378 0549 886377 |
| E.164 | +37866661212 | +3780549886377 |
How to write a San Marino number in E.164
- Remove spaces, dashes, dots and brackets so only digits are left.
- San Marino has no trunk prefix, so keep every digit of the national number.
- Put +378 in front. The result has 8 digits after the country code for a mobile.
So 66 66 12 12 becomes +37866661212. E.164 is the format SMS gateways, dialers and most CRMs store; see the E.164 format explained for why.
Mobile or landline?
San Marino allocates separate number ranges to mobiles and landlines, so a numbering-plan check reads the line type straight from the digits, for free. That type describes the range the number came from. It doesn’t prove the number is connected today.
Mobile, landline and special number ranges in San Marino
A San Marino mobile number starts with 61, 66 after +378. Every valid number of each type below starts with one of the digit groups shown. A number that starts the right way can still be unassigned: the groups say what a range is for, not that a number is connected.
| Type | Starts with, after +378 | Digits | Example |
|---|---|---|---|
| Mobile | 61, 66 | 8 | +378 66 66 12 12 |
| Landline (fixed line) | 0549 | 10 | +378 0549 886377 |
| Premium rate | 71, 77, 78 | 8 | +378 71 12 34 56 |
| VoIP | 51, 55, 58 | 8 | +378 58 00 11 10 |
Sources, checked 5 November 2026
- Ranges, lengths and examples: Google libphonenumber numbering-plan data (libphonenumber-js 1.13.15), the data our validator uses.
- Official plan: ITU-T E.164 national numbering plan for San Marino. The regulator’s filing is the authority when the two disagree.
Validate a list of San Marino numbers
Check a single number with the free phone number validator. For a whole file, upload the CSV to the verifier: every row gets a status, the E.164 number, the country and the line type, and emails in the same file get a live mailbox check. The Pro + Phone plan ($49.99 a month) adds 5,000 live carrier lookups a month for the real line type and current carrier.
Common questions
- What is the country code for San Marino?
- The country calling code for San Marino is +378. When you call San Marino from abroad, dial your international prefix (or +) followed by 378 and the number.
- How many digits is a San Marino phone number?
- A San Marino mobile number has 8 digits after the country code +378, and a landline has 10.
- How do I write a San Marino number in international format?
- Start with +378, then add the rest of the number. The mobile number 66 66 12 12 becomes +378 66 66 12 12, or +37866661212 in E.164, the form most CRMs and SMS tools expect.
- Can you tell if a San Marino number is a mobile?
- Usually, yes. San Marino numbers come from ranges allocated separately to mobiles and landlines, so a numbering-plan check reads the line type from the digits. It tells you what the range is for, not whether the number is in service.
- Does a valid format mean a San Marino number is in service?
- No. A valid format means the digits fit a range San Marino's numbering plan allocates. It cannot tell whether the number is connected today or who carries it, because numbers are reassigned and ported. A live carrier lookup reports the current carrier and line type, but even that does not prove someone answers.
- Can I check a list of San Marino numbers for free?
- Yes. Paste them in the list tab above or upload a CSV to the bulk phone number validator: E.164, country, format status and numbering-plan line type are free for every row, with no account. Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month).
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- Upload a CSV up to 100,000 rows with an email or phone column
- Every phone gets status, E.164 format, country and number type
- Emails in the same file get a real SMTP mailbox check
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