What is the country code for Vietnam?

Vietnam's country code is +84, assigned by the ITU under the E.164 international numbering plan. You dial it immediately after the US exit code (011 or +).

How do I call a Vietnamese mobile number from the US?

Dial 011 (or +) then 84, then the 9-digit mobile number without the leading 0. For example, if the Vietnamese mobile is 0987 654 321, dial 011 84 987 654 321.

How do I call a landline in Hanoi or Ho Chi Minh City from the US?

For Hanoi, dial 011 84 24 followed by the 8-digit subscriber number. For Ho Chi Minh City, dial 011 84 28 followed by the 8-digit subscriber number. Drop the leading 0 from the domestic area code.

What time should I call Vietnam from the US?

Vietnam is on UTC+7 year-round (no daylight saving). During US Eastern Daylight Time, Vietnam is 11 hours ahead; during Eastern Standard Time, it's 12 hours ahead. Early morning on the US East Coast (7–9 AM) corresponds to evening in Vietnam (6–8 PM), which is a practical window for personal calls.

How much does it cost to call Vietnam with Sayfone?

Sayfone offers calls to Vietnam at $0.22 per minute with transparent per-minute pricing. You call directly from your browser with no app download required.

Do I need to dial the area code for Vietnamese mobile numbers?

No. Vietnamese mobile numbers already include the network prefix (e.g. 98, 90, 32). After +84, simply dial the 9-digit mobile number. Area codes apply only to landline numbers.

Why does my call to Vietnam show 'number not in service'?

This usually means the number is incorrect or has changed. Vietnam migrated all mobile numbers from 11 digits to 10 digits in 2018, so older saved numbers may be outdated. Confirm the current number with your contact.

Quick Answer

How to Call Vietnam from the United States

From a US phone, dial 011 + 84 + the Vietnamese number (drop the leading 0). For example, to call a Hanoi landline 024 1234 5678, dial 011 84 24 1234 5678. With Sayfone, calls to Vietnam cost $0.22/min from your browser.

Start calling

Cost tools

🇺🇸From United States

To Vietnam🇻🇳

$0.22

Per minute

+84

Country code

Call quality

Landline rate

$0.22/min

Mobile rate

$0.22/min

Same per-minute Sayfone rate for landline and mobile.

Average call quality

With a growing Vietnamese diaspora in the United States, staying connected to family and business contacts in Vietnam is a common need. Vietnam uses country code +84 and operates on Indochina Time (UTC+7), which is 11–15 hours ahead of most US time zones depending on season and region.

Steps at a glance

Dial 011 (US international exit code) or use + on a mobile phone
Dial 84 (Vietnam's country code)
Dial the local Vietnamese number, dropping the leading 0
Press call — the full sequence looks like 011-84-XX-XXXX-XXXX

Sources

1
ITU – Vietnam country code +84
Confirms Vietnam is assigned country code +84 under ITU E.164
2
Wikipedia – Telephone numbers in Vietnam
Reference for Vietnam numbering plan structure

DIALING GUIDE

Step-by-Step: Call Vietnam from the US

Follow these steps to dial any Vietnamese mobile or landline number from a US phone or browser-based service.

1
Dial the US exit code
From a US landline or traditional phone, dial 011. On a US mobile phone, you can use the + symbol instead (press and hold 0 on most phones).
```
011 or +
```
2
Dial Vietnam's country code
Enter 84 immediately after the exit code. This routes your call to Vietnam's telephone network.
```
011 84 or +84
```
3
Dial the local Vietnamese number without the leading 0
Vietnamese domestic numbers start with 0 (e.g. 0987 654 321 for mobile, or 024 1234 5678 for a Hanoi landline). When calling internationally, drop that leading 0 and dial the remaining digits.
```
011 84 987 654 321 (mobile) or 011 84 24 1234 5678 (Hanoi landline)
```
Place the call
After entering the complete number, press call. The full dialing string for a Vietnamese mobile from a US phone is typically 12–13 digits. With Sayfone, enter the number in your browser at $0.22/min.

Dialing format reference

+84

Use these patterns when entering a full international number to +84.

Mobile

+84 XX XXXX XXX (9 digits after country code)

Landline

+84 [area code] [subscriber] (9–10 digits after country code)

+84 98 765 4321 (mobile)
+84 24 1234 5678 (Hanoi landline)
+84 28 1234 5678 (Ho Chi Minh City landline)

Major city area codes

Hanoi24

Ho Chi Minh City28

Da Nang236

Hai Phong225

Can Tho292

Sources

1
Vietnam Airlines – Vietnamese dialing format guide
Confirms international dialing format: exit code + 84 + number without leading 0
2
Wikipedia – Telephone numbers in Vietnam
Numbering plan structure and area code details

DIALING RULES

Vietnam Dialing Rules to Know

Key formatting and dialing rules for calling Vietnam from the United States. Getting these right avoids failed calls and misrouted connections.

Always drop the leading 0

Vietnamese domestic numbers begin with 0 (the trunk prefix). When dialing from the US, omit this 0 and dial only the digits that follow after +84. For example, 0987 654 321 becomes +84 987 654 321.

Mobile numbers are 9 digits after +84

Vietnamese mobile numbers consist of a 2-digit network prefix plus a 7-digit subscriber number, totalling 9 digits after the country code. Common mobile prefixes include 09x, 08x, 07x, and 03x.

Landline numbers vary by area code length

Landline numbers use a 2- or 3-digit area code followed by a 7- or 8-digit subscriber number, totalling 9–10 digits after +84. Hanoi (24) and Ho Chi Minh City (28) use 2-digit codes with 8-digit subscriber numbers; smaller cities use 3-digit area codes with 7-digit subscriber numbers.

Use 011 or + as the US exit code

From a US landline, dial 011 before the country code. From a US mobile, you can use the + symbol instead. Both route your call internationally to +84.

Some special numbers may not work internationally

Vietnamese toll-free numbers (1800) and premium-rate numbers (1900) may not be reachable from outside Vietnam. Emergency numbers (113, 114, 115) are domestic-only.

TIMING TIPS

Best Times to Call Vietnam from the US

Vietnam operates on Indochina Time (ICT, UTC+7) year-round with no daylight saving. The time difference from the US varies by region and season, so planning your call window matters.

🇻🇳

Because the US observes daylight saving time but Vietnam does not, the gap shifts by one hour between March and November. Early morning in the US generally aligns with evening in Vietnam — a practical window for personal calls.

Time & windows

US East Coast → Vietnam

11–12 hours ahead

12 hours during EST (Nov–Mar), 11 hours during EDT (Mar–Nov)

US Central → Vietnam

12–13 hours ahead

13 hours during CST, 12 hours during CDT

US West Coast → Vietnam

14–15 hours ahead

15 hours during PST (Nov–Mar), 14 hours during PDT (Mar–Nov)

🇺🇸Morning call from US East Coast

7:00–9:00 AM ET → 6:00–8:00 PM Vietnam (EDT) / 7:00–9:00 PM (EST)Good window for evening personal calls to Vietnam

🇺🇸Evening call from US East Coast

8:00–10:00 PM ET → 7:00–9:00 AM Vietnam (next day, EDT)Reaches Vietnam in the morning — suitable for business calls

🇺🇸Morning call from US West Coast

6:00–8:00 AM PT → 7:00–9:00 PM Vietnam (PDT) / 9:00–11:00 PM (PST)Evening in Vietnam during US summer; late night in Vietnam during US winter

Calling tips

Vietnam does not observe daylight saving time, so adjust your calculations when US clocks change in March and November.
Weekday mornings in Vietnam (8:00–11:00 AM ICT) are the reliable window for reaching businesses.
For personal calls, evenings in Vietnam (6:00–9:00 PM ICT) tend to work well — that's early morning on the US East Coast.
Vietnamese public holidays such as Tết (Lunar New Year, usually late January to early February) may affect business availability.

Business etiquette

Address contacts by their title and family name unless invited to use their given name.
Brief introductory pleasantries are customary before discussing business matters.
If calling a business in Vietnam, confirm the best time to reach them — lunch breaks (11:30 AM–1:00 PM ICT) may affect availability.

Sources

1
timeanddate.com – Vietnam time zones
Confirms Vietnam uses ICT (UTC+7) all year
2
timeanddate.com – Ho Chi Minh vs New York
Time zone converter for US East Coast vs Vietnam

TROUBLESHOOTING

Common Issues When Calling Vietnam from the US

If your call to Vietnam isn't connecting, check these common causes before redialing.

Forgot to drop the leading 0

Vietnamese numbers start with 0 when dialed domestically. If you include that 0 after dialing +84, the call will fail. Remove it and try again.

Wrong number of digits

After +84, a Vietnamese mobile number should be 9 digits and a landline 9–10 digits. If your number is shorter or longer, double-check with the recipient.

Call drops or doesn't connect

Network congestion or routing issues can occasionally cause dropped calls, especially during peak hours or holidays. Try calling again after a few minutes, or try a different time of day.

Receiving a recorded message in Vietnamese

A recorded message typically means the number is unreachable, disconnected, or out of service. Verify the number with your contact and confirm it hasn't changed — Vietnam undertook a major mobile number migration from 11 to 10 digits in 2018.

Savings

See what you could save

Adjust the tools below to compare Sayfone with typical retail pricing for calls to Vietnam. Start with one call, then layer on monthly volume to see the bigger picture.

How to use these tools

Sayfone uses your live rate for calls to Vietnam — the same basis as the rest of this page.
First, estimate savings on a single call length. Then, model a full month of minutes versus typical retail benchmarks.
Retail competitor rows are illustrative — not a quote from any carrier.