This free Portuguese phone number checker shows whether a number is valid.
A Portuguese phone number checker tells you whether a number is real, which means it follows Portugal's numbering rules and is assigned. Enter a +351 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Portugal's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +351
- Mobile numbers
- 9 digits after +351, starting 9
- Landlines
- 9 digits after +351, starting 2, such as +351Â 21Â XXXÂ XXXX
- Written at home
- 912 345 678
- Written for apps and SMS
- +351912345678
- Dialed from the US
- 011 351 912 345 678
A Portuguese mobile number is +351 followed by 9 digits, and the first one is 9.
Written with the country code
- +351Country code
- 9Mobile start
- 12 345 6788 more digits
The +351 comes before the number and is dropped when you dial inside Portugal.
A Portuguese phone number checker reads a number's format first and then checks it against Portugal's numbering plan.
This is the path one check takes. A number can be written correctly and still not be assigned to anyone, so the format check alone is not the answer.
- You enter the numberType it the way it is written at home, such as 912 345 678, or paste it with +351.
- Its format is checkedEach type of number has its own rules. A mobile needs 9 digits after +351 and starts with 9 at home.
- It is checked against the numbering planNumbers outside the US and Canada are checked against the numbering plan of their country, which for this page is Portugal's.Nothing is sent to the number, so it never rings and its owner is never told.
- You see valid or invalidWith the line type and country in a few seconds, and the carrier or network where one is listed.
A Portuguese mobile number has 9 digits after +351 and starts with 9, so any other length is not a valid mobile.
These lengths come from the numbering data for Portugal.
| Number type | Starts with at home | Digits after +351 | Written at home |
|---|---|---|---|
| Mobile | 9 | 9 | 912 345 678 |
| Landline | 2 | 9 | 21 XXX XXXX |
Three common mistakes make a Portuguese number fail the check, and each one is quick to fix.
Repeating +351 adds digits.
Write +351 912 345 678 once, with the country code at the front.
Typing too few or too many digits makes a number invalid.
A mobile number has 9 digits after +351. With 8 or 10 it cannot be a valid mobile, so look for a missing or doubled digit.
Leaving the wrong country selected changes how the number is read.
The checker reads a number by the rules of the country selected above, so keep Portugal selected for a +351 number. Paste a number with its + and country code and the country is read from the number itself.
These are the questions people ask most about checking Portuguese phone numbers.
How do I check if a Portuguese phone number is valid?
Enter the number in the box above with Portugal selected. The free checker returns valid or invalid in seconds, with the line type and country. Type it the way it is written at home, such as 912 345 678, or in full as +351 912 345 678.
How many digits is a Portuguese phone number?
A mobile number has 9 digits after +351. A landline has 9 digits after +351, such as +351 21 XXX XXXX.
What does a Portuguese mobile number start with?
Mobile numbers start with 9 at home, which is 9 after +351. The next digit is usually 1, 2, 3 or 6.
How do I write a Portuguese number for an app or an SMS tool?
Use the E.164 form: a plus sign, 351, then the number and no spaces, such as +351912345678.
Does the Portuguese phone number checker show the carrier?
It shows the carrier or network where one is listed. Numbers outside the US and Canada are checked against the numbering plan of their country rather than live carrier data, so some come back with no carrier name.
Does valid mean the Portuguese number is active?
No. Valid means the number is real, correctly written for Portugal and assigned. Whether a line is switched on and reachable right now is a different question, and the free HLR lookup answers it.
Can I check a whole list of Portuguese phone numbers?
Yes. This free tool checks one number at a time. A 7-day free trial opens CSV upload and the API, at 1 credit a number.
Does the person know I checked their number?
No. The check reads records only. No call or text goes to the number, so its owner is never told.
What are the landline area codes of Lisbon and Porto?
The codes are 21 for Lisbon and 22 for Porto. From abroad you dial +351 and then the code, so Lisbon is +351 21. The area code is part of the digits of a landline number.
You can check numbers from other countries on their own pages.
- +61Australian phone number checker
- +1Canadian phone number checker
- +44UK phone number checker
- +353Irish phone number checker
- +91Indian phone number checker
- +65Singapore phone number checker
- +234Nigerian phone number checker
- +64New Zealand phone number checker
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- +27South African phone number checker
- +254Kenyan phone number checker
- +233Ghanaian phone number checker
- +971UAE phone number checker
- +92Pakistani phone number checker
- +880Bangladeshi phone number checker
- +94Sri Lankan phone number checker
- +852Hong Kong phone number checker
- +256Ugandan phone number checker
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- +260Zambian phone number checker
- +356Maltese phone number checker
- +357Cypriot phone number checker
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- +34Spanish phone number checker
- +33French phone number checker
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- +593Ecuadorian phone number checker
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- +1Dominican phone number checker
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- +598Uruguayan phone number checker
- +506Costa Rican phone number checker
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These free tools answer the next question about a number.
- The +351 country code pageHow to dial Portugal, the time there now and the landline places.
- HLR lookupCheck whether a mobile number is switched on and reachable right now.
- Line type lookupSee whether a number is a mobile, a landline or VoIP.
- Carrier lookupFind the carrier or network behind a number.
- Phone validator for any countryThe same check with the country picker open to every country.
- Phone validation APIRun the same check from your own software, one request per number.
Sources: Google's libphonenumber numbering data for lengths, mobile starts and landline starts, as of September 24, 2026; the ITU list of country codes.