This free Vietnamese phone number checker shows whether a number is valid.
A Vietnamese phone number checker tells you whether a number is real, which means it follows Vietnam's numbering rules and is assigned. Enter a +84 number above and 1Lookup's free checker returns valid or invalid in seconds, with the line type and country, checked against Vietnam's numbering plan.
Pick the country, then enter the number without the country code.
Free & rate-limited. No signup required to try.
- Country code
- +84
- Mobile numbers
- 9 digits after +84, or 10 written at home, starting 01, 03, 05, 07, 08 or 09
- Landlines
- 10 digits after +84, starting 02, such as +84Â 24Â XXXXÂ XXXX
- Written at home
- 0912 345 678
- Written for apps and SMS
- +84912345678
- Dialed from the US
- 011 84 912 345 678
A Vietnamese mobile number is +84 followed by 9 digits, and the first one is 1, 3, 5, 7, 8 or 9.
Written with the country code
- +84Country code
- 9Mobile start
- 12 345 6788 more digits
Written at home
- 0Replaces +84
- 9Mobile start
- 12 345 6788 more digits
The +84 and the 0 do the same job, so a number is never written with both.
A Vietnamese phone number checker reads a number's format first and then checks it against Vietnam'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 0912 345 678, or paste it with +84.
- Its format is checkedEach type of number has its own rules. A mobile needs 9 digits after +84 and starts with 01, 03, 05, 07, 08 or 09 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 Vietnam'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 Vietnamese mobile number has 9 digits after +84 and starts with 01, 03, 05, 07, 08 or 09, so any other length is not a valid mobile.
These lengths come from the numbering data for Vietnam. A mobile number has 10 digits when it is written at home with its 0.
| Number type | Starts with at home | Digits after +84 | Written at home |
|---|---|---|---|
| Mobile | 01, 03, 05, 07, 08 or 09 | 9 | 0912 345 678 |
| Landline | 02 | 10 | 024 XXXX XXXX |
Three common mistakes make a Vietnamese number fail the check, and each one is quick to fix.
Keeping the 0 after +84 adds a digit.
The 0 is only for dialing inside Vietnam, so +84 0912 345 678 is wrong. Drop the 0 and write +84 912 345 678.
Typing too few or too many digits makes a number invalid.
A mobile number has 9 digits after +84. 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 Vietnam selected for a +84 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 Vietnamese phone numbers.
How do I check if a Vietnamese phone number is valid?
Enter the number in the box above with Vietnam 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 0912 345 678, or in full as +84 912 345 678.
How many digits is a Vietnamese phone number?
A mobile number has 9 digits after +84, or 10 written at home. A landline has 10 digits after +84, such as +84 24 XXXX XXXX.
What does a Vietnamese mobile number start with?
Mobile numbers start with 01, 03, 05, 07, 08 or 09 at home, which is 1, 3, 5, 7, 8 or 9 after +84.
How do I write a Vietnamese number for an app or an SMS tool?
Use the E.164 form: a plus sign, 84, then the number without its leading 0 and no spaces, such as +84912345678.
Does the Vietnamese 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 Vietnamese number is active?
No. Valid means the number is real, correctly written for Vietnam 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 Vietnamese 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 Hanoi, Ho Chi Minh City and Da Nang?
At home the codes are 024 for Hanoi, 028 for Ho Chi Minh City and 0236 for Da Nang. From abroad the 0 is dropped, so Hanoi is +84 24. The area code is part of a landline's digits, and a mobile number has none.
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
- +60Malaysian phone number checker
- +66Thai phone number checker
- +63Philippine phone number checker
- +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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- +966Saudi phone number checker
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- +52Mexican phone number checker
- +55Brazilian phone number checker
- +34Spanish phone number checker
- +33French phone number checker
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- +81Japanese phone number checker
- +82South Korean phone number checker
- +20Egyptian phone number checker
- +90Turkish phone number checker
- +972Israeli phone number checker
- +48Polish phone number checker
- +54Argentine phone number checker
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- +32Belgian phone number checker
- +41Swiss phone number checker
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- +351Portuguese phone number checker
- +58Venezuelan phone number checker
- +593Ecuadorian phone number checker
- +502Guatemalan phone number checker
- +1Dominican phone number checker
- +591Bolivian phone number checker
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- +506Costa Rican phone number checker
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These free tools answer the next question about a number.
- The +84 country code pageHow to dial Vietnam, 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.