Vietnam Phone Number Format & Country Code +84
Vietnamese mobile numbers are 10 digits locally starting with 0. The trunk prefix 0 is dropped for international dialing, leaving 9 digits after the country code. After a 2018 migration, all mobile numbers use the new prefix format. To dial a Vietnam number internationally, replace the local trunk prefix with +84. For example, 091 234 5678 becomes +84 91 234 5678. NumSwift converts between these formats automatically, validating each number against Vietnam's numbering plan.
Last updated: 2026-03-18
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How to Format Vietnam Phone Numbers Correctly
- Identify whether the number is in local format (e.g., 091 234 5678) or already includes the +84 country code
- Paste the number into NumSwift and select Vietnam as the country
- NumSwift converts it to the standard international format: +84 91 234 5678
- Use the formatted number for international calls, WhatsApp, SMS, or CRM import
Why Understanding Vietnam's Number Format Matters
- Avoid failed calls by using the correct +84 prefix instead of local-only formats
- Vietnam's 9-digit structure means numbers that are too short or too long are invalid — NumSwift catches these errors
- Convert freely between local (091 234 5678) and international (+84 91 234 5678) notation
- Works with all Vietnam carriers including Viettel, Mobifone, Vinaphone
Frequently Asked Questions
▶What is the country code for Vietnam?
Vietnam's country code is +84. When dialing a Vietnam number from abroad, you replace the local trunk prefix with +84. For example, the local number 091 234 5678 becomes +84 91 234 5678 in international format.
▶How many digits are in a Vietnam phone number?
Vietnam phone numbers are 9 digits after the country code. Vietnamese mobile numbers are 10 digits locally starting with 0. The trunk prefix 0 is dropped for international dialing, leaving 9 digits after the country code. After a 2018 migration, all mobile numbers use the new prefix format. NumSwift validates the digit count automatically, so incorrectly truncated or padded numbers are flagged as invalid.
▶What is the difference between mobile and landline formats in Vietnam?
In Vietnam, mobile numbers start with 03, 05, 07, 08, or 09 locally. Landline numbers use different prefixes and may have a different digit distribution between the area code and subscriber number. NumSwift distinguishes between the two types and formats each one correctly.
▶How do I dial a Vietnam number from another country?
Replace the local trunk prefix with +84 and dial the remaining digits. For example, 091 234 5678 becomes +84 91 234 5678. NumSwift performs this conversion automatically when you paste a Vietnam number and select the correct country. The formatted output is ready for calling, WhatsApp, or saving to your contacts.